Masato, a teenager faced with difficulties in studying, becomes a central figure in history, where ordinary methods of increasing performance take an unexpected turn.
His parents, trying to help him, hire private tutors.
However, the choice falls on the sisters of Shinjo, who, as it turned out, have long been mocking Masato at school.
These meetings, instead of becoming a chance of improving assessments, turn into continuation of his torment, but now in his own house.
Sinzo"s sisters, using their power as tutors, turn the educational process into a series of humiliation and bullying, which not only does not help improve the educational results of Masato, but also leaves deep wounds in his psyche and physical condition.
Each lesson with them becomes a test that he is forced to transfer alone, not having the opportunity to share his experiences with his parents, who, it seemed, did not see the true face of his hired teachers.
However, the life of Masato takes an unexpected turn
, when he accidentally meets Outomo, the owner of a secret club "Tender Donna ".
This acquaintance opens up new horizons in front of him and gives hope for a change.
Outomo, having learned about his problems, offers him to use the hypnosis device, which, according to her, can help him restore justice.
Despite his doubts, Masato decides on an experiment that has a much broader effect than he could assume.
The device not only changes the behavior of the sisters of Shinjo, forcing them to rethink their actions and attitude to Masato, but also extends their influence to everyone who was in any way connected with this story.