Harem setups keep the protagonist in relationships with several heroines at once, with everyone aware of the arrangement and often fine with it — the opposite of a structure that forces you to choose one. Each heroine brings her own personality and stake, and the protagonist sits at the centre, so the real question is how to keep every thread alive at the same time.
The appeal is not having to give anyone up, plus the scenes only this structure allows: heroines interacting with each other, competing for attention or working together. Two designs recur — routes played separately before converging, or a shared living arrangement starting mid-story. Coverage here notes the heroine count and how they relate, what triggers convergence and whether a dedicated group ending exists, with recommended route order, ending conditions and reviews.
