Tenko Yokohama attends Arama Academy as Kenta's classmate, frequently appearing in classroom scenes with fellow students. Her noticeably flat chest compared to peers becomes central to Episode 9 when a train groper overlooks her, emphasizing her "A-Cup Angst" and causing distress. Miss Machiko consoles her by recounting similar childhood experiences, including a flashback of young Machiko enduring teasing. Tenko joins group retaliations against Kenta and his friends, such as instances where female students punish boys' pranks by stripping them. She exhibits conflicted reactions to harassment: when Kenta accidentally gropes her chest during a note-theft attempt, she initially feels flattered before expressing outrage. Her background, family, and development remain unexplored beyond school interactions. Her role in films, OVAs, or spin-offs extends no further than basic inclusion in live-action film credits.