Kyonyuu JK Saiin Choukyou: Kimonii wa Imouto wo Milk Nomi Ningyou ni

Hikida Reina is a bright and popular honor student, admired by everyone at school. She lives in the same house as her shut-in brother, Hikida Tooru, who harbors dark intentions toward her. Tooru possesses a dangerous aphrodisiac technique that allows him to control his target with a single spell, leaving no trace of his actions.

Using this power, Tooru sets a terrible trap for Reina. No matter how much he violates her, once the spell wears off, she loses all memory of what happened. Without realizing it, Reina's body is gradually defiled and trained beyond repair, trapped in a cycle of abuse she cannot remember.