Boku wa Onee-chan no Omocha
僕はお姉ちゃんのおもちゃ
A young person's life takes an unexpected turn after their parents remarry, introducing a new step-sister who is described as beautiful. The step-sister's intentions remain unclear, as they do not seem to be based on friendship or romantic feelings. The arrival of this new family member marks a significant change in the protagonist's previously uneventful life.
