Ootomo Ryuusuke

A student at a private, F-rank university, he has recently been hired by the Ichinose family as a part-time tutor.

However, he is made fun of by his student Azusa and disliked by her mother, Sakiko, and gradually grows resentful of the two.

He borrows an accessory-type hypnotic sound wave receiver and remote control from a senior student at his university for monitoring tests.

In his frustration, he plans to use it to play a mild prank on the family where he works part-time.