Suki na Ko no Imouto

Yuka Amamiya confesses her feelings to Nagisa Hanabusa, only to be turned down. Still heartbroken, Nagisa's younger sister, Mino, suggests a plan to help Yuka move on. Mino offers to take Nagisa's place, allowing Yuka to experience what she had wanted with Nagisa. They begin spending time together, with Mino dressing as Nagisa. As their interactions continue, Yuka finds herself developing feelings for Mino, despite her initial intentions.