Aunt Chisato and her niece Hibiki have been close for a long time. Chisato likes Hibiki as a woman, so she has mixed feelings when she hears that Hibiki has recently gotten a boyfriend. One day, Hibiki comes to Chisato's house saying that she had a fight with her boyfriend. Chisato kisses Hibiki while she is sleeping. Hibiki is surprised, but is touched by Chisato's kindness. Chisato passionately entangles her tongue with Hibiki's.