Muscle maniac Kaho Hibi and her upperclassman from the basketball team, Natsume-sempai, have been continuing their relationship as “muscle buddies.” But while his muscles used to be the target of her affections, things are changing quickly... Now it's Natsume himself that she's falling in love with. After finally waking up to her feelings for him, she's made a plan of attack to tell him during the school festival! But what happens when Natsume's childhood friend, Ikkei, can't hide his feelings for her anymore...? The love triangle continues in volume 6!