During a family trip, Akari loses her return ticket and only Katayama and Akari are able to arrange it, resulting in them having to spend the night together in the same room. However, it turns out that this was a plan by Akari, who has harbored feelings for Katayama since childhood, to be alone with him! Akari, who wants to convey her pure feelings, pressures Katayama for a physical relationship, but he refuses due to his sense of responsibility as a guardian. However, when Akari, with her teary eyes, says, "Just the mouth, that's not sex, right...?" and gives him a loving blowjob, his reason crumbles...
