Kamata is the last real town before the airport. It sits at the bottom of Ota Ward where the Keihin-Tohoku line, the Tokyu Ikegami line and the Tokyu Tamagawa line all pile into one station, and it has the specific texture of a place that has always worked for a living — machine shops, a legendary density of cheap yakiniku, black-vinegar gyoza, and public baths that are still actually baths. It is not a nightlife destination. Nobody takes the train to Kamata for atmosphere. What Kamata has is position: eight minutes from Kawasaki, eleven from Shinagawa, and close enough to Haneda that the last flight of the night is a factor in how the neighborhood behaves after midnight.
The shop is OKINI Tokyo in 蒲田 — Okini Tokyo in Kamata — a deriheru (delivery health; outcall only, she comes to your room) filed under Cityheaven's standard classification. Phone is 03-6424-7577. Hours are 16:00 to 05:00, 年中無休, no closed days. Official site is kamaoki.net. It's part of a chain with siblings in Tachikawa, Tokorozawa, Kawagoe and Fuchu, which matters mainly because chain shops tend to run their price boards as spreadsheets rather than as moods — and this board rewards being read like a spreadsheet.
The dispatch map is a train line
The listed dispatch area is Kamata, Omori, Shinagawa, Gotanda, Kawasaki. Look at that on a map and it's not an area at all, it's a route: Shinagawa, Omori and Kamata are consecutive stops on the JR Keihin-Tohoku line, Kawasaki is the next one after Kamata across the Tama River into Kanagawa, and Gotanda hangs one stop off the side on the Yamanote — also, not coincidentally, the far terminus of the Ikegami line that starts at Kamata.
So the shop covers the Keihin corridor, end to end, and nothing else. No Shinjuku, no Shibuya, no Ikebukuro. That's a deliberate piece of scoping and it's the honest kind — a shop that promises the strip it can actually service inside a reasonable drive rather than claiming half of Tokyo and then quoting you an hour's wait.
The house system: you choose the course after the first five minutes
Here's the thing that makes this shop worth writing about rather than just tabulating.
The shop's own copy: ★Okini流・出会って5分の即密着サービス！ サービスを受けてからご利用コースを決められます — "the Okini method: immediate close contact within five minutes of meeting. You can decide your course after receiving service." Their stated reasoning is refreshingly unromantic: 多く時間を取りすぎた！余ってしまうなどの事態が発生いたしません — so you don't end up having booked too much time and having it go to waste.
Read that as a consumer-protection feature and it's mildly nice. Read it against the shop's own extension prices and it's worth actual money, which I'll get to once the ladders are on the table. But hold the shape of it in your head: in a normal deriheru, the "I want more time" decision happens in the room, at extension rates. Here, the shop's system puts that decision before the course is fixed — which, if the course rates apply, means the same minutes are bought on the cheaper of the shop's two price schedules.
The base service set, published: Dキス (deep kiss), 全身リップ, 生フェラ, 玉舐め, 指入れ, 密着69, スマタ, 口内発射, ローションプレイ, and 時間内無制限 — no cap on finishes within your time. This is a standard shop, not a full-service one, and the prohibited-conduct list says so with unusual bluntness: coercion of 本番, filming, drugs, and intoxication are all listed as matters they will report to the local police. They also require cut nails, compliance with the shower-and-gargle hygiene routine, and a room that actually has a shower. That's a compliance posture, and a long explicit one is generally the sign of a shop that has had to enforce it.
Three ladders, and they're all the same ladder
The price page prints four blocks. Two of them are identical, so really it's three, and which one you're on depends entirely on what time you call.
| Minutes | New-customer / Omakase | Happy Hour · Platinum (16:00–20:00) | Basic (20:00–) |
|---|---|---|---|
| 60 | ¥17,000 | ¥18,000 | ¥19,000 |
| 75 | ¥20,000 | ¥21,000 | ¥23,000 |
| 90 | ¥24,000 | ¥25,000 | ¥27,000 |
| 120 | ¥32,000 | ¥33,000 | ¥35,000 |
| 150 | ¥40,000 | ¥41,000 | ¥43,000 |
| 180 | ¥48,000 | ¥49,000 | ¥51,000 |
| 210 | ¥57,000 | ¥58,000 | ¥60,000 |
| 240 | ¥65,000 | ¥66,000 | ¥68,000 |
| 270 | ¥73,000 | ¥74,000 | ¥76,000 |
| 300 | ¥81,000 | ¥82,000 | ¥84,000 |
Now subtract the columns instead of reading them. Basic minus Happy Hour is ¥2,000, on every rung from 75 up. Basic minus new-customer is ¥3,000, on every rung from 75 up. On the 60, both shrink by a thousand — ¥1,000 and ¥2,000.
That's not me pattern-matching. The shop's coupon page states it outright: 最大3000円OFF【ご新規割】— 60分2000円割引 / 75分以上のご利用で3000円割引. Two thousand off the 60, three thousand off everything at 75 and above. The published ladders and the published coupon agree to the yen.
So there are not three price schedules here. There is one price schedule and two flat subtractions.
One rate, and it never moves
Take the differences going down a column instead of across. On the new-customer ladder: 75→90 is ¥4,000 for fifteen minutes. 90→120 is ¥8,000 for thirty. 120→150, ¥8,000. 150→180, ¥8,000. 210→240, ¥8,000. 240→270, ¥8,000. 270→300, ¥8,000.
¥8,000 per thirty minutes. ¥266.67 a minute. And it holds in all three columns, because the columns are just each other plus a constant. The 16:00 rate and the 04:00 rate for a minute of this shop's time are identical; what changes is a flat access charge stapled to the front.
Then check the intercept, because this is the part I had to run twice:
New-customer price = ¥266.67 × minutes. Exactly. No fixed fee at all.
75 → ¥20,000. 90 → ¥24,000. 120 → ¥32,000. 150 → ¥40,000. 180 → ¥48,000. Five consecutive rungs that sit on a pure proportional line with a zero intercept. I go through a lot of these boards and that is genuinely rare — nearly every shop in Tokyo bakes a door charge into the entry course and lets the per-minute column drift downward so it looks like a volume discount. This one, in its middle band, charges for time and nothing else.
Which throws the two exceptions into hard relief:
| Minutes | Price | The ¥266.67 line | Premium |
|---|---|---|---|
| 60 | ¥17,000 | ¥16,000 | +¥1,000 |
| 75–180 | (as printed) | (identical) | ¥0 |
| 210 | ¥57,000 | ¥56,000 | +¥1,000 |
| 240 | ¥65,000 | ¥64,000 | +¥1,000 |
| 270 | ¥73,000 | ¥72,000 | +¥1,000 |
| 300 | ¥81,000 | ¥80,000 | +¥1,000 |
A thousand yen at the short end, a thousand yen at the long end, and a clean five-rung stretch in the middle where you're paying the raw rate.
The 60 is the worst cell on the board, and the fix costs ¥3,000
That +¥1,000 on the entry course exists because the new-customer discount is capped there — ¥2,000 off instead of ¥3,000. The shop gives you the full discount only once you're at 75 minutes.
The consequence is the single most actionable number here. Going from the 60 to the 75 costs ¥3,000 for fifteen minutes — ¥200 a minute, against a house rate of ¥266.67. Those are the cheapest fifteen minutes anywhere on this price board, by a wide margin, and they're cheap precisely because you're not paying the rate, you're buying back the withheld thousand yen.
If you are choosing between the 60 and the 75 at this shop, take the 75. The 60 is the only course where you're paying a premium over the house line, and the escape hatch is priced below cost.
The extension is where the ordinary logic returns
| Extension block | Price | Per minute | vs. the ¥266.67 house rate |
|---|---|---|---|
| 15 min | ¥6,000 | ¥400.00 | ×1.50 |
| 30 min | ¥10,000 | ¥333.33 | ×1.25 |
| 60 min | ¥20,000 | ¥333.33 | ×1.25 |
Those multiples are too clean to be accidental — one-and-a-quarter for the big blocks, one-and-a-half for the small one. The shop is not gouging by industry standards; a 25% in-room premium is unremarkable and plenty of places charge more. But it means the comfortable read on this board is exactly backwards from what the front page implies.
Put booking prices and extension prices side by side for the same minutes:
| Minutes added | Cost at booking | Cost as an extension | Multiple |
|---|---|---|---|
| 15 (60 → 75) | ¥3,000 | ¥6,000 | 2.00× |
| 30 (90 → 120) | ¥8,000 | ¥10,000 | 1.25× |
| 60 (120 → 180) | ¥16,000 | ¥20,000 | 1.25× |
The fifteen-minute block costs exactly double in the room what it costs at the phone. Same girl, same room, same fifteen minutes — the only variable is when you decided.
So the house system is worth about what you'd guess
Now put the two halves together, which is the whole reason this shop is interesting.
The Okini system says you choose your course after the first five minutes. The extension table says minutes decided in the room cost 1.25× to 2× minutes decided at booking. If the course you name after those five minutes is billed at course rates — and the shop's framing is that it is, since it's presented as choosing your course rather than extending one — then the system is worth the entire spread between those two tables. On a man who thinks he wants sixty minutes and discovers he wants ninety, that spread is ¥27,000 the old way (¥17,000 + a ¥10,000 extension) against ¥24,000 the Okini way. Three thousand yen, for a decision made twenty-five minutes earlier.
That's the argument. Here's the honest hole in it: the price page does not spell out the mechanics. It doesn't say whether those first five minutes run against your clock, whether the deferred choice is available on the discounted ladders or only at basic rates, or what happens if you pick a course the girl's schedule can't accommodate. Every one of those is a phone question, and 「ヘブン見た」 plus 「クーポン見た」 at the top of the call is the shop's own instruction for getting a straight answer. Ask before you're in the room. The system is only worth money if it works the way the copy implies, and the copy is copy.
Two more things the board is telling you
The 210 is a toll booth. Every thirty-minute step on this ladder costs ¥8,000 except one: 180 → 210 costs ¥9,000. The extra thousand never comes back off — it's why the entire 210-and-up block sits above the line. Practically: the 180 is the last rung of the clean rate, and crossing into long-course territory carries a one-time thousand-yen entry fee that you then keep paying at every longer course.
The rental course is priced above the path that reaches it. The 貸切 block runs ¥104,000 for six hours, then ¥125,000 / ¥146,000 / ¥167,000 / ¥188,000 through ten. That's a flat ¥21,000 per additional hour — which is ¥350 a minute, above the house rate and above the extension rate. Per-minute cost therefore rises with length here, from ¥288.9 at six hours to ¥313.3 at ten, which inverts how every volume ladder in this business is supposed to behave.
| Rental | Price | Per min | 300-min course + 60-min extensions | Rental premium |
|---|---|---|---|---|
| 6 h | ¥104,000 | ¥288.9 | ¥101,000 | +¥3,000 |
| 7 h | ¥125,000 | ¥297.6 | ¥121,000 | +¥4,000 |
| 8 h | ¥146,000 | ¥304.2 | ¥141,000 | +¥5,000 |
| 9 h | ¥167,000 | ¥309.3 | ¥161,000 | +¥6,000 |
| 10 h | ¥188,000 | ¥313.3 | ¥181,000 | +¥7,000 |
The gap widens by a thousand yen an hour. The caveat, and it's a real one: 貸切 means exclusive booking, and the page never says what that buys beyond minutes — it may well carry permissions the standard course doesn't, and it certainly carries a guarantee that nobody's schedule cuts you off, which the extension path explicitly does not. If you're buying six hours because you want six uninterrupted hours, ¥3,000 is a cheap insurance premium. If you're buying it because you assumed the long course was the efficient one, it isn't.
What isn't on the page
Three gaps, and you should know all of them before you dial.
Transport is unpublished. The shop's own line: 交通費などはお気軽に電話にてお問い合わせください — please just ask by phone. This sits directly under a claim of 明朗会計, clear and open accounting, which is a little awkward, because transport is the only variable cost on the whole sheet and it's the one number that isn't printed. Across a dispatch range running from Gotanda to Kawasaki — which crosses a prefectural border — that could plausibly be a spread of several thousand yen. Get it quoted before you commit, not after.
Nomination isn't priced. There's no 指名料 on the price page at all. What the sheet does price is the inverse: the お任せコース — the omakase course, where the shop picks — carries a ¥1,000 discount, and it's the only course on which the Platinum member discount can be stacked (お任せコースに限りPM会員様の割引併用可能). Stack omakase with the early/Happy Hour discount and you land on ¥17,000 / ¥20,000 / ¥24,000 / ¥32,000 — the new-customer ladder, to the yen, on all ten rungs.
That last point is the best-kept thing on this page, so let me say it plainly: the first-timer price is not restricted to first-timers. A returning customer who calls in the 16:00–20:00 window and takes the omakase course pays exactly what a brand-new customer pays. The price of choosing your own girl, in that scenario, is the ¥1,000 omakase discount you give up — which is the closest thing to a nomination fee this shop has. (The fine print on whether the early and Platinum discounts are additive or alternative routes to the same ¥2,000 is ambiguous in the text; the printed ladders say alternative. Worth confirming on the call.)
At least one cast member is off the ladder. The shop's recommended list includes a girl tagged 特別料金 — special pricing. Everything above describes the standard board, and the standard board has named exceptions. If you're picking from the lineup rather than taking omakase, check whether the name you want carries her own rate.
And one genuine plus that's easy to skim past: 入会金等もございません — no membership or entry fee. Plenty of Tokyo shops open with a ¥2,000–3,000 first-visit charge that would swallow most of the new-customer discount. This one doesn't have it, which means the discounted number on the board is close to the number you actually pay, transport aside.
What it actually costs
The floor, for a first-timer: ¥17,000 for sixty minutes, plus an unquoted transport fee. No entry fee, no card surcharge published on the page.
The number I'd actually pay: ¥20,000 for the 75. It's the first rung on the honest part of the ladder, it costs ¥3,000 more than the 60 for fifteen minutes that would cost ¥6,000 as an extension, and it's the point where the shop stops holding back a thousand yen of the discount.
The lineup, for what it's worth as context: the visible roster runs young — the current week's shift board shows women in the 18-to-23 range — with new entries logged on 7/16, 7/22, 7/29, 8/3, 8/7, 8/8, 8/10 and one already posted for 8/16. That's eight new cast in a month. Constant intake is how a mid-market chain shop keeps its board full; it also means the roster you look at today is not reliably the roster next month, so nominating on the strength of a review you read in spring is a coin flip.
Verdict
- Rate transparency: ★★★★★ — one invariant ¥8,000-per-thirty rate across three ladders, and a middle band with literally no fixed fee buried in it. The columns and the coupon page agree to the yen, which is more than most shops manage.
- Concept: ★★★★☆ — deciding your course after five minutes is a real structural answer to the most expensive decision in this trade, and it's the reason to pick this shop over the four other Kamata deriheru on the same rate. Marked down only because the mechanics aren't documented.
- Extension pricing: ★★★☆☆ — 1.25× is fair by the standards of the industry; the 15-minute block at double the booking price is not, and it's the one to avoid.
- Disclosure: ★★★☆☆ — no entry fee and a fully printed course board, undercut by an unpublished transport charge across a five-station dispatch range.
- The rental block: ★★☆☆☆ — costs more than assembling the same hours out of a 300 and extensions, unless exclusivity itself is what you're buying.
- Going back: ○ — on a weekday, calling at 16:30, taking the 75, having asked about the transport quote first.
What I keep coming back to is that this board has a thesis. Most price sheets in this business are accretions — a discount bolted on in 2019, a long course somebody's manager invented, an extension rate nobody has revisited. This one is built on a single rate that never moves, sold at three different distances from that rate depending on when you call, with the margin moved out to the edges where fewer people shop. And sitting on top of it is a house system that exists specifically so you don't have to buy the expensive minutes. Kamata is a town that has always worked for a living and has never once pretended to be glamorous about it. The shop matches the neighborhood: no atmosphere, no mythology, a rate card you can do in your head on the train down from Shinagawa, and one good idea about when you're allowed to make up your mind.