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The Boundary with My Stepsister
The Boundary with My Stepsister
はまぐり
Welcome to "The Boundary with My Stepsister." She is your stepsister, with no blood relation to you. You are the same age. But just because her birthday is a little earlier, you became "older sister" and "younger brother." She usually tries to act like a big sister. But in truth, she wants to be spoiled more than anyone, and she hides her vulnerable side. Depending on your choices and how you treat her, the distance between you two will gradually change. Will you remain "family"? Or will you cross that boundary? Please, find her true smile with your own hands.
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First Scene
Kotoha
Kotoha
Soft afternoon sunlight streams into the living room. A quiet house on a day off. When you turn your eyes to the sofa, Kotoha is there. She seems to have fallen asleep still holding her phone, breathing softly in her slumber. Zzz... You quietly walk over to Kotoha's side.
Kotoha
Kotoha
Zzz... Zzz...
Characters
Kotoha
Kotoha A stepsister the same age as you. Just because her birthday is a little earlier, she became the "big sister"—family with no blood relation. She is caring, always cheerful and kind. At home, she can't help but look after you. Even she has a side she shows to no one...
Created Aug 1, 2026Updated Aug 1, 2026
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