Butterfly's Poison; Blood Chains

PROTOTYPE · 2023 · $44.99 · Adventure · deal grade B

Measured on 2026-09-26 16:17 UTC, 9 days ago. The whole catalog is re-measured daily; a game that just launched can move fast between passes.

Estimated net residual revenue: $889 to $1.3k per month
Opportunity: $2.1k per month at x1.90 dormancy
Estimated lifetime owners: 4.2k
94% positive across 105 reviews · 4.0 reviews/month

Why it's flagged

Developer silent for 2.3 years
Studio quiet across its whole catalog
Store page localized in only 2 language(s)

Analyst notes (AI-assisted)

Note written 2026-08-22; the live figures above take precedence over any numbers in it.

A dark-romance adult otome visual novel with branching routes, originally Japanese, now available in English translation on Steam.

Butterfly's Poison: Blood Chains sits in a niche but persistently profitable corner of Steam: adult visual novels with strong community loyalty and minimal localization competition. The title has generated $37.7k lifetime from just 3,360 units at a $45 price point, carries a 94% positive rating, and continues to earn $1.1k/mo in residual revenue with zero promotional spend in the last 12 months. The opportunity lies not in volume growth but in catalog acquisition for a visual-novel publisher or IP licenser seeking back-catalog stability and high conversion rates. Risk is material: the studio (PROTOTYPE, Japan-based, fading) has posted no updates in 26 months, the game has never discount-sold, and Chinese localization remains incomplete (68% gap), signaling either deliberate curation or resource depletion. Most realistic play: acquisition.

Risk: Developer PROTOTYPE shows fading studio status with no posts in 26 months and only one title on record; long-term support and bug fixes may be unavailable.
Risk: Adult visual novels face periodic platform policy scrutiny and regional payment restrictions, limiting audience expansion even with stable product quality.
Risk: Significant Simplified Chinese localization gap (68%) suggests untapped regional revenue, but completion may require third-party investment the original developer is unwilling or unable to fund.

This case as Markdown · Estimates carry ±30-50% error per title.