The Game Census
マーダーミステリーパラドクス このひと夏の十五年 cover art

マーダーミステリーパラドクス このひと夏の十五年

213℉ · Aniplex Inc. · 2023-12-01

Steam

AdventureIndie

Modes: Single player · Perspectives: Text

Releases: Dec 01, 2023 (PC (Microsoft Windows))

"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.

86%
positive of 292 reviews
Very Positive
steam's rating (official)
0–20,000
owners (SteamSpy est.)
Playable
Steam Deck (Valve)
SteamOS: Playable
$19.99
steam price (US)

August, 2004. Shikinejima — a secluded island that only a few hundred people call home. Fifteen-year-old Itsuki Amazawa has come to visit the island for the very first time. At his adoptive mother's childhood home, he and his newly met cousins pass the summer days in peace and quiet. That is, until Itsuki learns the truth about the island... Strange incidents known to the locals as "Shikinejima Vanishings" have been occurring around the island. And deeply entangled in these puzzling happenings are people that Itsuki holds dear. Will he be able to uncover the truth and save those he cares a(Storyline via IGDB)

Health check

Quietly active
  • · 35 reviews in the last 8 weeks (~4/week).
  • · Review velocity down 29% vs the prior 8 weeks.
  • · Top 26% of 27,555 Adventure games in the census by review count.
Estimated sales: 5.8k–13k copies

Review-multiple estimate from 292 total reviews — how this is computed.

Current store prices

lowest across shops (ITAD)$19.99

Deal snapshots via CheapShark, refreshed daily.

All-time low: $8.99 at Steam (2026-07-31)via IsThereAnyDeal

12-month high $19.99 · on sale 9 of 19 observed days (census price snapshots)

Review momentum

PositiveNegative
656520232026Week of 2023-12-01: 65 positiveWeek of 2023-12-01: 8 negativeWeek of 2024-01-01: 11 positiveWeek of 2024-01-01: 3 negativeWeek of 2024-02-01: 6 positiveWeek of 2024-02-01: 2 negativeWeek of 2024-03-01: 13 positiveWeek of 2024-03-01: 2 negativeWeek of 2024-04-01: 10 positiveWeek of 2024-05-01: 3 positiveWeek of 2024-05-01: 2 negativeWeek of 2024-06-01: 6 positiveWeek of 2024-06-01: 2 negativeWeek of 2024-07-01: 8 positiveWeek of 2024-07-01: 2 negativeWeek of 2024-08-01: 2 positiveWeek of 2024-09-01: 3 positiveWeek of 2024-09-01: 2 negativeWeek of 2024-10-01: 4 positiveWeek of 2024-11-01: 1 positiveWeek of 2024-12-01: 4 positiveWeek of 2024-12-01: 1 negativeWeek of 2025-01-01: 4 positiveWeek of 2025-02-01: 1 negativeWeek of 2025-03-01: 4 positiveWeek of 2025-03-01: 1 negativeWeek of 2025-04-01: 7 positiveWeek of 2025-05-01: 9 positiveWeek of 2025-06-01: 5 positiveWeek of 2025-06-01: 1 negativeWeek of 2025-07-01: 6 positiveWeek of 2025-07-01: 2 negativeWeek of 2025-08-01: 5 positiveWeek of 2025-08-01: 1 negativeWeek of 2025-09-01: 3 positiveWeek of 2025-09-01: 1 negativeWeek of 2025-10-01: 3 positiveWeek of 2025-10-01: 1 negativeWeek of 2025-11-01: 5 positiveWeek of 2025-12-01: 5 positiveWeek of 2026-01-01: 5 positiveWeek of 2026-01-01: 2 negativeWeek of 2026-02-01: 5 positiveWeek of 2026-02-01: 1 negativeWeek of 2026-03-01: 3 positiveWeek of 2026-05-01: 3 positiveWeek of 2026-05-01: 1 negativeWeek of 2026-07-01: 2 positiveWeek of 2026-08-01: 6 positiveWeek of 2026-08-01: 2 negativeWeek of 2026-09-01: 3 positiveWeek of 2026-09-01: 1 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Price history

$19.99$8.992023-12-012026-10-082023-12-01 — best price $17.992024-01-08 — best price $17.992024-02-15 — best price $15.992024-03-14 — best price $13.992024-03-31 — best price $13.992024-06-04 — best price $13.992024-06-27 — best price $13.992024-07-18 — best price $13.992024-08-31 — best price $12.992024-10-14 — best price $12.992024-11-27 — best price $11.992024-12-19 — best price $11.992025-01-13 — best price $11.992025-03-03 — best price $11.992025-03-13 — best price $11.992025-04-10 — best price $11.992025-05-26 — best price $11.992025-06-27 — best price $9.992025-08-22 — best price $9.992025-09-29 — best price $9.992025-11-29 — best price $9.992025-12-18 — best price $9.992026-01-12 — best price $9.992026-03-05 — best price $9.992026-04-19 — best price $9.992026-06-04 — best price $9.992026-06-25 — best price $9.992026-07-31 — best price $8.992026-09-18 — best price $8.992026-10-08 — best price $19.99
Lowest recorded price across tracked stores, per day (census snapshots).

Details

WindowsSingle-playerDualShock Controller SupportDualShock Controller SupportPartial Controller SupportFamily Sharing1 DLC

1 supported languages: Japanese

Post-launch support: 1 DLC released, first 2024-06-27 (Steam store data)

Player tags

2DAnimeDramaHorrorMysteryRomanceColorfulAdventureText-BasedTime Travel

Census log

Computed from census-recorded observations only — dates are observation dates.

Players also track

REVEILReturn to Shironagasu IslandUntil ThenBahnsen KnightsYour Turn To Die -Death Game By Majority-Schrödinger's CallDEVIL'S LIMINALHomicipher

Similarity via IGDB.

Official site ↗