Steam game

海子 UMIKO

"海子 UMIKO" is a psychological horror visual novel. Engage in conversations with Umiko, complete various mini-games, solve puzzles, and gradually piece together the dark truths she tries to hide about herself and her dimension from fragmented narratives. Preserve your fragile friendship for a week!

Free September 24, 2025

By 盾构机 Tunnel Boring Machine

Windows
View on Steam
海子 UMIKO - 盾构机 Tunnel Boring Machine. Popular. Released September 24, 2025
Screenshot of 海子 UMIKO gameplay showing in-action mechanics Screenshot 2 of 海子 UMIKO - additional gameplay view Screenshot 3 of 海子 UMIKO - more gameplay footage Screenshot 4 of 海子 UMIKO - final gameplay screenshot

Overview

About this game

"海子 UMIKO" is a psychological horror visual novel. Through direct conversations between the player and the unfamiliar girl "Umiko," as well as fragmented narratives hidden within mini-games and puzzles, this game pieces together a past event that occurred in her dimension.

Game Content

Engage in conversations with the unfamiliar girl "Umiko,"

complete various mini-games, solve puzzles,
read hidden texts, collect all the photos in the album,
piece together the complete story of Umiko and her dimension's past and present,

attempt to change how the story ends,
and do everything you can to maintain your fragile friendship for a week!

Game Duration: Approximately 1 hour; 
Number of Endings: 6 wrong endings and 1 true ending.

About Story

This is a story about 【Ending】.
As summer approaches and summer nears its end,

the lively and adorable unfamiliar girl "Umiko" sends you a cross-dimensional call request.
Chatting with her might be a great way to pass the time!
Whether the topic is friendship, food, or fashion, she is always willing to talk openly with you.
Gradually uncover Umiko's story and the world she inhabits through lighthearted and harmonious interactions!

...However, what exactly is the 【unforgivable, irreversible thing】 that Umiko has been trying to hide, the thing she once did?
When and where did the story about 【Me】, 【Leader】, and 【Senior】 that appears on the screen take place?
The occasional static, screen distortions, and faint low-frequency noises...
Everything feels unsettling yet intriguing.

Still, no matter what happens on the other side of the screen, it won't affect 【you】, so there's nothing to worry about.

Content Warning

During gameplay, there may be loud noises, screen flickering, and sudden horror elements. This game is not suitable for individuals with photosensitive epilepsy, children or those who are easily disturbed.

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