It's been two years since they started dating. Shoko (Sasakura) has begun to think about marrying her fellow teacher Tadashi, but he still hasn't proposed to her, making her anxious. Then, she receives an email from a former student, Manami (Abe), on Tadashi's mobile phone... Though she knows she shouldn't, Shoko sneaks a peek at it. Along with the threatening message, she finds a photo of Tadashi touching the buttocks of Eri (Maeda), who was also one of his students...