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Sisters: Last Day of Summer is an adult-labeled, fully animated visual novel from developer Jellyfish and publisher JAST. Its premise pairs a quiet countryside household with a family secret: a boy wakes in an unfamiliar home, where Akiko and her daughters Haruka and Chika welcome him.
What kind of game is Sisters: Last Day of Summer?
Steam describes it as a fully animated visual novel and lists Adventure and Casual as genres. The story begins when a boy wakes in a strange house and is taken in by a woman and her two daughters. JAST identifies them as Akiko, Haruka and Chika, and frames the setting as daily life in a countryside home where something remains unspoken. JAST’s synopsis emphasizes both the domestic setup and the hidden secret, without explaining it.
Is the game fully animated?
Yes. Steam and JAST present it as a fully animated visual novel. A June 10, 2025 report by Bahamut GNN says the international release is based on Jellyfish’s high-definition SISTERS ~ Natsu no Saigo no Hi ~ ULTRA EDITION remake, which redrew many images. The report attributes to an official presentation the figure of more than 3,000 animation drawings; that is a reported production detail, not an independently audited count.
Who are Akiko, Haruka and Chika?
Akiko is the mother of Haruka and Chika. They are the household that welcomes the boy after he wakes in an unfamiliar home. The publisher’s description centers the story on their countryside family life and the secret that shadows it; it does not disclose that secret in the synopsis.
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What languages does the Steam version support?
Steam lists English and Simplified and Traditional Chinese for the interface and subtitles, and Japanese for full audio. Bahamut GNN’s June 2025 report also says the international release supports Korean, with the Korean version offered on an exclusive platform in Korea. That report does not establish Korean availability on Steam.
Is Sisters: Last Day of Summer Adults Only?
JAST labels the game “Adults Only.” Steam also carries a developer-provided mature-content notice: “Some women wear bewitching clothes with open bosoms.” That brief notice should not be treated as a complete content advisory; check the storefront’s current age and content information before buying.
Rank #2
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Release date, features and PC requirements
Steam lists June 3, 2024 as the release date, with Jellyfish as developer and JAST as publisher. The Steam listing includes single-player, Steam Cloud and Family Sharing. Its published PC specifications are:
| Specification | Minimum | Recommended |
|---|---|---|
| Operating system | Windows 10 | Windows 10 |
| Processor | Core i5 | Core i5 |
| Memory | 8 GB RAM | 16 GB RAM |
| Graphics | 512 MB graphics | 1 GB graphics |
| DirectX | Version 9 | Version 9 |
| Storage | 10 GB available; SSD required | 10 GB available; SSD required |
These are the requirements shown on the Steam listing; check that page for any updated specifications or availability in your region.
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- Our tank tops are designed for comfort and style. The women's sleeveless tank features a classic crew neck, wide straps, and a modern muscle-tank fit. The men's version offers a relaxed scoop neckline and traditional straps.
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- Our tank tops are designed for comfort and style. The women's sleeveless tank features a classic crew neck, wide straps, and a modern muscle-tank fit. The men's version offers a relaxed scoop neckline and traditional straps.
- The women's muscle tank features heather fabric, offering an ultra-soft feel with dimensional color
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