Yuma suddenly joins an all-boys school trip as a surprise guest, working as the bus guide. Riding the wave of the students' wild excitement, her eagerness to serve quickly spirals out of control. Teenage dicks stay instantly rock-hard. She gives blowjobs to students suffering from motion sickness, and during a masturbation session in an empty parked car, a student returns unexpectedly, leading to lucky sex. During the drinking party at the lodging, the class president shows up and tempts her into teacher-absent sex. Later, wearing a yukata for a commemorative photo, she barges into a room, gets carried away stripping, and triggers an all-out orgy.