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About Promise with My Sister

Promise with My Sister is an exploration, adventure, construction and RPG game. You build a team of sisters, explore different areas and stages, and develop your team as you progress.

Build your team

Each sister has her own personality, which you can cultivate. You can choose among three sister abilities and train according to your adventure to create a lineup that suits you. Explore along different routes and use different strategies as you venture deeper to find more sisters. Events let you strengthen your bonds with them.

You can use items to enhance the sisters, including unique items that you can drag into a scene to change the rules of exploration. Collecting memories with the sisters unlocks items and makes them stronger in the next round.

Explore and fight

The game has multiple stages, with different areas and adventures to explore. Battles are automated, leaving you to focus on exploration and developing your team.

Frequently asked questions

Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.

Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.

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