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

Released Dec 2023

"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.

85% positive · 290 reviews
Done
All announced content has been released
High confidence
Done
All announced content has been released
High confidence

Where to buy

Steam $8.99 $19.99 −55%
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Evaluation

Murder Mystery Paradox: Fifteen Years of Summer launched on December 1, 2023 as a complete, self-contained text adventure with approximately 10 hours of content and multiple endings. The only post-launch content released was a digital art book DLC (175 pages of character and background illustrations), which shipped on June 27, 2024. Of the 13 developer news posts on record, 11 are non-content communications such as sales announcements, anniversaries, and streams — none announce future story content, expansions, or additional DLC. The game's store description presents it as a finished product with a clear scope. No unshipped DLC, roadmaps, or developer statements about future content exist. With both the base game and its sole DLC now released and no further content signaled, the game is complete.
Evidence
Game launched on December 1, 2023 as a complete text adventure with a 10% launch discount.
news post · Dec 1, 2023 source content shipped
high
Developer announced the art book DLC as now available, with no mention of any future content or additional plans.
news post · Jun 28, 2024 source content shipped
medium

Content

1 of 1 released · no outstanding content

Media

Details

Developer
Publisher
Aniplex Inc.
Achievements
—
Platform
Windows
Controller
partial support
Steam Deck
Playable
Players
Single-player

About this game

.

■Game Features

.A text adventure game in which the player searches for the culprit through deduction and conversation.
The game system is based on the motif of "Murder Mystery", a new genre of analog games.
Even if you have never played "Murder Mystery" before, you can enjoy the game.
It takes about 10 hours to complete the game.
The game features multiple endings, with the ending branching off depending on the player's choices.
A wealth of hints to guide players when they get stuck in solving the puzzles.
A demo version is now available to play the first few hours of the game. The full version of the game can be played by skipping the trial version.
The entire game is available for download.

■Game Outline

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"The culprit is in here!"

You will take part in the search for the culprit of an incident that took place in a closed situation. However, you yourself are one of the suspects and are suspected by the others.

In the limited time available to you, you will gather clues to the case through conversations with the suspects, deduce from them, and uncover the truth. At the same time, you will need to gain the trust of those around you in order to clear your own suspicions.

If you end up without enough credibility, you may be made the culprit. ......

■Game System

.The mystery part of the search for the culprit proceeds in the following order: "Investigation Phase → General Discussion Phase → Voting Phase".

Investigation Phase.
Through one-on-one discussions with the suspects, information and questions about the case will be elicited.

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By providing information and answering questions in conversation, you will gain the trust of the other party and get to the bottom of the case.

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General Discussion Phase.
Each of the suspects will argue in turn what they have deduced about the case and the culprit within the investigation phase. Depending on whose arguments you agree with and whose arguments you deny, your own credibility will change.

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Voting Phase.
Based on the information obtained in the investigation phase and the general discussion phase, each suspect votes for the person they think is the culprit. The person with the highest number of votes will be detained as the culprit by you.

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■Synopsis

.August 2004.
Shikine Island, a remote island with a population of a few hundred.
A 15-year-old boy "Tatsuki Amazawa" visited Shikinejima for the first time this summer.
At his adoptive mother's family home, he meets his cousins who are not blood related and spends a peaceful time with them.

At that time, Tatsuru still did not know.
He did not know that a mysterious incident called "Shikinejima's Kamikakushi" had been happening again and again on the island.
And that the people he cares about are deeply involved in the mystery.

Will Tree be able to unravel the truth behind the mysterious incidents and save the people he cares about? ......

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■Distribution Guidelines

Revised: March 1, 2024
The entire scope of video distribution of this work is now available for distribution.
In order to ensure that as many viewers as possible can enjoy the film, when distributing content that contains spoilers, please clearly indicate in the title that the content contains "Spoilers" or similar wording.
Last evaluated Jun 21, 2026
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