「校則は絶対よ？だってルールだもの。」生徒指導の那美先生はいつも皆に厳しく、鬼教師と恐れられていた。学級委員として真面目に過ごしていた僕には優しく接してくれて、その優しさに好意を抱いていた。そんな尊敬できる那美先生がまさか、卑猥な行為に没頭していたなんて。ある日の放課後、那美先生がノーパン姿で露出行為に明け暮れている姿を目撃してしまったのだ。そして、僕に気付いた那美先生は僕をその卑猥な行為に誘ってきて…。

"School rules are absolute, you know? Because they're the rules." Ms. Nami, the student guidance teacher, was always strict with everyone and feared as a strict teacher. She was kind to me, who was diligently serving as class representative, and I had grown fond of her because of her kindness. I never imagined that Ms. Nami, whom I respected so much, was engrossed in lewd acts. One day after school, I witnessed Ms. Nami engaging in exhibitionism without wearing any underwear. Then, noticing me, Ms. Nami invited me to join in her lewd activities…