# Sex Trainer's Diary: Hidden Kink

> ResidualPlay case file: an overlooked Steam game still earning residual revenue. Estimates carry a ±30-50% error range per title.

- Steam appid: 4218020
- Developer: 老二打鐵舖
- Publisher: Oπ
- Released: 2026 · Genre: Casual · List price: $19.99
- Deal grade: C (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $11.1k to $16.7k per month (mid $13.9k)
- Opportunity score: $13.9k/month at x1.00 dormancy multiplier
- Est. lifetime owners: 5.4k · Est. lifetime net revenue: $36.0k
- Review sentiment: 78% positive across 207 reviews (168 from Steam purchases)
- Review velocity: 83.0 reviews/month (6-month average)

## Why it's flagged

- Developer active, last post 2 months ago
- Last build shipped 2 months ago
- Store page localized in only 4 language(s)

## Where a gross dollar goes (monthly, at current velocity)

| Stage | USD/month |
|---|---|
| Gross storefront sales | $25.2k |
| After VAT / sales tax (-13% blended) | $22.0k |
| After refunds (-9.5% median) | $19.9k |
| Net to developer (after Steam 30%) | $13.9k |

## Monthly review counts, oldest to newest (2 months)

159, 7

## Markets by review language

- french: 1% (game NOT localized in this language)
- english: 33%
- koreana: 2% (game NOT localized in this language)
- russian: 2% (game NOT localized in this language)
- japanese: 10%
- schinese: 52% (game NOT localized in this language)
- brazilian: 1% (game NOT localized in this language)

Localization gap: 58% of measured reviews are written in languages the game does not support (top: schinese). Localizing is likely immediate market expansion.

## Methodology

Units are estimated from Steam-purchase reviews times a release-cohort multiplier (Boxleiter method, 20-75x by year). Revenue uses an effective price (lifetime discounts and regional pricing) and nets out VAT (~13%), refunds (~9.5%) and Steam's 30% cut: roughly 55% of gross reaches the developer.

Source: https://residualplay.com/game/4218020
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.