Home / Games / マーダーミステリーパラドクス このひと夏の十五年
マーダーミステリーパラドクス このひと夏の十五年
"Murder Mystery Paradox: Fifteen Years of Summer" is a text-based adventure game. Enter the remote and sparsely populated island of Shikinejima and attempt to solve the strangely recurring mystery found there.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-14.
“マーダーミステリーパラドクス このひと夏の十五年 is a narrative-focused mystery adventure that translates the structure and tension of tabletop murder mystery games into a carefully paced single-player experience. Developed by 213℉ and published by Aniplex Inc., the game leans heavily into…”
— a player, Steam review · 11 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-08-13. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
“Murder Mystery Paradox: Fifteen Years of One Summer” – 2nd Anniversary!
“Murder Mystery Paradox: Fifteen Years of That Summer” celebrates its 2nd anniversary on Tuesday, December 2, 2025! A huge thank you to everyone who has played the game!! To commemorate this milestone
40% OFF Sale!
Spring Sale 2025: "Murder Mystery Paradox: This One Summer's Fifteen Years" and related titles are on sale! Murder Mystery Paradox: This One Summer's Fifteen Years: 40% OFF Murder Mystery Paradox: Thi
40% OFF Sale!
Murder Mystery Paradox: Fifteen Years of Summer” at Steam Winter Sale 2024 The sale is on for all related titles! Murder Mystery Paradox: Fifteen Years of Summer: 40% OFF Murder Mystery Paradox: Fifte
40% OFF Sale!
Murder Mystery Paradox: Fifteen Years of Summer” at Steam Winter Sale 2024 The sale is on for all related titles! Murder Mystery Paradox: Fifteen Years of Summer: 40% OFF Murder Mystery Paradox: Fifte
The first anniversary of the release
Murder Mystery Paradox: Fifteen Years of Summer celebrated its first anniversary on Monday, December 2, 2024. Thank you very much to everyone who has played the game! To commemorate this first anniver
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-14.
| Genres | Adventure, Indie |
| Player tags | Adventure · Visual Novel · Choose Your Own Adventure · 2D · Anime · Text-Based · Colorful · Split Screen · Time Travel · Drama · Horror · Mystery (SteamSpy community voting) |
| Features | Single-player · Partial Controller Support · Family Sharing |
| Languages | Japanese |
| Official site | https://mmparadox.com |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS: Windows10 64bit Processor: Intel Core i3-6006U Memory: 4 GB RAM Graphics: Intel HD Graphics 520 DirectX: Version 10 Storage: 4 GB available space