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.
- Release date
- September 3, 2026
- Platforms
- Windows
- Developer
- PLK Studio
- Publisher
- PLK Studio

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About Mashumaro Trigger!
Every Day with MashumaroHer skin is as white as her name, and her cheeks are soft and springy and impossibly squishy. The whole neighborhood knows this first-grader as "Mashumaro-chan"—Mashiro plus marshmallow. Endlessly curious, entirely without guile. She gets her words wrong now and then, and that only makes her more lovable. Watching over her, always close by, is her big sister Mio. With their parents overseas, she looks after Mashiro day in and day out.
This is a slice-of-life comedy about the happy chaos these two get into. Laugh, unwind, and once in a while, tear upEveryday life with Mashiro, Mio, and all the people who fill their days.A lot of laughing, a lot of comfort, and the occasional lump in your throat. The kind of days that grow more precious when you look back. Over 160,000 words of "days that come only once."Bright little moments, stacking up until one day they're memories you'd never trade.
CastMashiro — A first-grader with famously squishy cheeks, the neighborhood's beloved "Mashumaro-chan." Always honest, always full of wonder. Mio — Mashiro's big sister. A good cook with her feet on the ground—and hopelessly soft on her little sister. And plenty more. Friends, neighbors, and family—each with a personality all their own—color the two sisters' days.…
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