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Kazushi, a university student living alone, is troubled by the presence of two childhood friends, sisters, who hang out all the time at his apartment. The cheeky older sister, Ayane, and the laid-back younger sister, Kotone. With the two always around, Kazushi has been semi-forced into a life of abstinence for a long time... One day, a trivial argument leads Kazushi to take a bath with the sisters in the apartment's tiny bathroom. Even though he is still wearing his swimsuit, the soft touch of them clinging to his body makes Kazushi's reason waver.

That night after their secret affair in the bathroom, Kazushi is unable to sleep due to excitement and feelings of guilt. While Kazushi is like that, Kotone and Ayane are sleeping soundly in a row as usual. Inspired by the glimpse of her bare legs peeking out from under the covers, Kazushi starts to touch Kotone's body again as they sleep together, thinking that she forgave him once. However, the person he thought was Kotone and put his hands on was actually Ayane.

The day after a depraved night with his sisters, Kazushi is walking along, reflecting on the events of the previous night, when Ayane, with whom he now has the most awkward relationship, appears before him. When Kazushi apologizes cordially in front of his apartment, Ayane surprisingly doesn't seem angry. On the contrary, the moment she enters his room, she asks him with tearful eyes, "If you want to continue what happened yesterday... give me a kiss..."

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"Huh... you were lonely without me...?" Ayane and Kazushi are finally alone at the sports festival, where they go to cheer on their sisters, and the atmosphere is good...! But then Ayane's classmates enter the girls' locker room while they're having a secret rendezvous!? In a panic, Kazushi and Ayane take refuge in the narrow locker room to avoid being seen. They spend several minutes pressed together, holding their breath. Kazushi loses himself in the warmth and heartbeat of Ayane, and the sweet scent of sweat mixed with her...

"Because you're like family to me... I can always be by my big brother's side," Kotone mutters sadly as she steals Kazushi's lips. As the sports festival draws to a close, Kazushi learns the girl's true feelings in an empty classroom bathed in the sunset. "I don't mind being second... just look at me for now," Kotone says as she tries her best to convey the words, grabbing Kazushi's hand and making him touch her chest. With his heart beating painfully fast, Kazushi comes to a conclusion...