You Don't Mind, Kuramochi-san!?

Kazuya Kuramochi is a high school student who has always been overshadowed by his older sister, Mio, a popular and outgoing girl who seems to excel at everything. While Mio is the center of attention, Kazuya prefers to stay in the background, quietly observing life from a distance. Their dynamic is turned upside down when Mio's best friend, the cheerful and teasing Natsuki, starts taking an interest in Kazuya, much to his confusion.

As Natsuki begins to spend more time with him, Kazuya finds himself drawn into her world, where her playful advances blur the lines between friendship and something more. With Mio caught between her loyalty to her friend and her protective instincts over her brother, the trio's relationships become increasingly complicated. Kazuya must navigate his growing feelings while dealing with the secrets and desires that threaten to surface, leading to a steamy and unexpected connection.