Watch Sister Breeder OVA Episode 4

Episode 4: Student council president Rena Omiya has long struggled with the increasingly obsessive affection of her younger stepbrother, Shota. With their parents away from home for an extended period, his inappropriate behavior gradually escalates from childish teasing into relentless emotional manipulation and sexual coercion. Unable to escape the situation, Rena finds herself drawn into an abusive relationship that threatens to destroy the boundaries of their family. As she loses the strength to resist, the arrival of their younger stepsister, Aina, places their carefully hidden secret in danger of being exposed. Blending psychological drama with themes of domination, obsession, and forbidden relationships, the story follows the devastating consequences of manipulation within a fractured household.