In class, Hikari, who is popular, is entrusted with a love letter by her best friend Risa. The recipient is Hikari's ex-boyfriend, Yamada, who is handsome but clumsy, and Hikari disliked him. One day, while suffering from a headache and lying in the health room bed, Hikari is raped by Yamada. Risa, who came to check on her out of concern afterwards, witnesses the incident and becomes furious. Enraged, Risa teams up with Yamada to inflict further hell on Hikari.
