Imouto sae Ireba Ii.

Itsuki Hashima is a talented young novelist with one obsession dominating nearly everything he writes: little sisters. His life away from fiction is hardly less peculiar. Nayuta Kani is a genius author who loves him and has almost no sense of embarrassment, Haruto Fuwa is a successful fellow writer who shares the pressures of the profession, Miyako Shirakawa sometimes tries to be the only normal person in the room, and Itsuki’s perfect younger stepbrother Chihiro manages the household while hiding a major secret.

Deadlines, strange games, trips, taxes, and professional jealousy make their days comfortably chaotic, but each of them carries fears and ambitions that do not surface during the jokes. The writing that brings them together can make friendship, rivalry, and love more complicated all at once.