To prevent molestation of girls in schools the government has implemented a new program for testing men who wish to become teachers. Equipped with heartbeat monitoring devices to determine arousal they bring in 3 volunteers: High School Girl Tsumugi, Middle School Girl Hotaru and Elementary School Girl Mihina to expose themselves and commit increasingly lewd speech and behavior to test whether the men can control their libido.

Note: This game contains no scenes of penetrative sex.