Cleavage: Koibito wa Oneesan

Synopsis

When their father is given a transfer, Todo Yuto and Todo Erika are left alone. They are siblings, but they are not blood related. When Yuto was a child, his mother died. His father remarried a woman who, herself, had a child from a previous relationship, Erika. His stepmother was quite gentle, but she, too, has since passed away. Living alone, they begin to love each other as a man and a woman. However, an art teacher, Sayaka, notices their relationship and... (Source: AnimeNfo)

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