the fuji couple teaches at the same school. they have good relationships with their students and each other. one day after school, an incident occurs. fuji's husband accidentally witnesses a senior student, iizuka, bullying a classmate. the husband gets angry with iizuka, who denies it. kanna tries to stop him but fails, and the husband hits iizuka. kanna, not wanting to make a big deal out of it, apologizes to iizuka the next day without her husband's knowledge. however, iizuka, unable to forgive the husband's corporal punishment, orders kanna to undress...