On a family trip, Juri loses her return ticket, and Katayama and Juri are the only ones who can make arrangements, and they end up staying overnight in a shared room. - However, this was a plan for Akari, who has been in love with Katayama since childhood, to be alone with him! - Katayama refuses to have a sexual relationship with Akari, who expresses his pure feelings to her and presses her for a physical relationship, but out of a sense of responsibility as her guardian. - However, when he looks at her with wet eyes and gives her a loving blowjob, his rationality collapses...