Hana, a friend of his mother, comes to Tokyo to help her son move and stays overnight. The son, Yasuo, feels his heart race at her arrival. As the night progresses and the atmosphere warms, his mother ushers him out, saying, "Now it's time for adults." Left alone and lonely in his room, Yasuo is soon visited by a cheerful, slightly drunk Hana. As they talk, she moves closer and closer, making him nervously excited until he can no longer hide his arousal. Noticing his bulge, Hana smiles and gives him a kiss, whispering, "Let's continue after your mother falls asleep," before leaving the room. A tender and innocent relationship unfolds.