Mashumaro Trigger!

Mashiro has marshmallow-soft cheeks, and her big sister Mio absolutely adores her. Ordinary days—days that come only once—and the precious moments hidden inside them. A slice-of-life novel about the happy chaos of two sisters. A sweet, marshmallow-soft little while, just for you.

At a glance

• Platform: Windows.
• Genres: Adventure, Casual, Indie, Free To Play.
• Release date: Sep 3, 2026.
• Steam user reviews: No user reviews.
• Delivered as a Steam library entitlement — activation is handled by Steam.

Minimum

Recommended

System requirements as published by the developer on Steam.

Activate on Steam

• Open the offer above — it takes you to this game's official Steam store page.
• Buy it there, or if you bought a key elsewhere, open Steam and choose Games → Activate a Product on Steam.
• Enter the product code exactly as it was issued to you.
• The game appears in your Steam library — download and play.

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