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Yoshino, a girl who spends her days in solitude stumbles across a mysterious book in a secondhand bo...
Heavy plot here. The ml is a fallen angel -> devil, he's collecting soul (esp women by sex). The fml is an orphan & when her parents die, she signed a contract with the ml. The payment for the contract is sex/smut, once every month but since the fml is young, there's no penetration/no more than kiss & touch. The ml basically raised the fml so at some point, the fml thinks of him as a family/father.
The fml is not weak, the ml has obsession.
WARNING: Might contain rape & cause discomfort.