ADN-274 On a typhoon night, I was left behind at school with a student until morning… Natsume Saishun.

A major typhoon that comes once every few years. I thought I'd go home early today... but before I knew it, it was already the usual time. Trains are suspended... roads are flooded... in the end, I had to stay overnight at school. Just then, "Teacher... what are you doing here so late?" Student Utsumi also got stranded at school. Until morning, the two of us alone in the spacious school building, a dangerous and lewd night was about to begin.