Imouto Sae Ireba Ii. Direct

: A college classmate of Itsuki’s who provides a grounded perspective and eventually pursues a career as an editor.

: The protagonist, a novelist whose obsession with "imoutos" stems from past emotional trauma and an inferiority complex. Imouto sae Ireba Ii.

: A genius author who is madly in love with Itsuki. Despite her success, she struggles with her own past and eccentricities, such as only being able to write while naked. : A college classmate of Itsuki’s who provides