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CLEAVAGE: Koibito wa Oneesan
CLEAVAGE～恋人はお姉さん
After their father is transferred for work, Todo Yuto and Todo Erika are left to live alone. Though they are siblings, they are not blood related: Yuto's mother died when he was young, and his father remarried a woman who had a daughter from a previous relationship, Erika. His kind stepmother has also since passed away, leaving the two of them on their own.
Living together without any adult supervision, Yuto and Erika's bond deepens beyond that of brother and sister. They begin to love each other as a man and a woman, exploring a forbidden relationship in the privacy of their home. However, their secret does not go unnoticed for long.
An art teacher named Sayaka becomes aware of their relationship and begins to take an interest in them. Her involvement threatens to expose their hidden affair, forcing Yuto and Erika to confront the consequences of their forbidden love.
