I want to find out the secret of Mizuki-sensei who is a natural and a little naughty...!!? Tenma Akitaka, a curious junior high school boy, has something that he is curious about. That person is Mizuki-sensei, the homeroom teacher for my class. She gives the impression of being plain with her glasses and messy clothes, but for some reason this female teacher with a cute face always visits the old old school building!!! Unable to suppress his intellectual curiosity, Tenma decides to find out her secret. However, the more she searches for her teacher, the more she keeps repeating naughty and natural happenings towards Tenma!!? She should be searching, but her naughty inquisitive spirit is being satisfied!! Will Mizuki sensei's naughty happenings happen? Will you be able to find out her secret without losing? The teacher is a secret observational romantic comedy that will satisfy your natural and erotic intellectual curiosity――♪