Smartphone: Unravel a Dark Mystery from a Locked Room

8/23/2026, 11:49:23 PM

Release date: 8/23/2026

Tags: #adventure #interactive-fiction #choose-your-own-adventure #2d #text-based #dark #horror #mystery

Reference prices

Japan

¥ 297 (JPY)

Steam JP

$2.54 (USD)

Steam Global

Live Store Snapshot

Body text may reflect the state at publication time. For the latest sale, price, and review changes, prioritize the live price panel, review panel, and the Steam store listing.

Japan Price: ¥ 297
Global Price: $2.54
Price in Your Region: ¥ 297-15%Prices as Steam lists them per country. What you are actually charged depends on your Steam account settings.Regional prices checked: 27 Aug 2026
Sale Status: On sale
Price Checked At: 8/30/2026, 3:26:26 AM

Key highlight

A psychological horror adventure where you escape a locked room by investigating a smartphone. Make choices that alter the narrative and uncover a dark truth.

🖥️ Hardware Guide for Comfortable Play

Based on the game's recommended specs, showing a comfortable performance target and example parts (PassMark reference)

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CPU

Game's recommended spec

Intel Core i5-7500 以上

Comfortable play target

8,353 pts(~130% above spec of 6,425 pts)

Parts near this range

Intel Core i7-6700 @ 3.40GHz8,332 pts Intel Core i3-1215UE8,331 pts ARM - 32 Core 3000 MHz8,376 pts

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GPU

Game's recommended spec

Intel UHD Graphics 620 以上

Comfortable play target

1,351 pts(~130% above spec of 1,039 pts)

Parts near this range

GeForce GTS 4501,355 pts Radeon HD 57701,346 pts Radeon HD 7560D + HD 7700 Dual1,346 pts

* Scores are reference values. Actual performance varies by in-game settings, resolution, and system environment.

Build a PC to match this performance → BTO Guide

Details

Overview

Awakening in an unfamiliar, locked room with no clear way out, your only companion is a smartphone. This psychological horror adventure from OwataStudio tasks you with navigating the device's interface – calls, messages, and apps – to uncover clues and find your escape. Every choice you make, every piece of information you trust, shapes the unfolding narrative. As you gather more fragments of truth, a disturbing reality behind the incident begins to surface.

Highlights

Immersive Smartphone Interaction: Experience a unique gameplay loop where you directly interact with the smartphone's screen, mimicking real-world usage to explore and deduce.
Branching Narrative & Multiple Endings: Your decisions and actions directly influence the story's progression, leading to various distinct conclusions.
Psychological Horror & Mystery: Delve into a chilling atmosphere as you piece together the truth, gradually approaching the heart of the mystery within the confines of the room.

Who It's For

Fans of text-based adventures, interactive fiction, and psychological horror will find themselves engrossed in the tense atmosphere and narrative-driven puzzles. If you enjoy games that rely on deduction and careful decision-making, this title offers a compelling experience.