From Exiled Rebels Scans:
Mizutani (29) got tired of life so at the recommendation of a good friend, he is now enjoying his second youth by pretending to be a high school student. His only worry is being observed for some reason by homeroom teacher Kuriyama. Moreover, he is found out by the teacher in a bar (legally) and dragged to a love hotel and is given an unbelievable confession!? Then he’s threatened with blackmail pictures, and forced to become lovers with the teacher!?
Includes Oukyuu Kisu, Onegaishimasu! (Emergency Kisses, Please!) oneshot.