Kwon Yongmin is a very pure-hearted guy with a very intimidating face. People being what they are, always label him as a delinquent and a terrifying one at that. Due to a series of misunderstanding (coupled with him oftenly misinterpreting what's happening), he was suddenly given the position of the "School Guardian" A.K.A head thug.

In a world where creatures are being summoned from their home worlds to do the bidding of their masters, the more powerful the two's bond is, the more the people respect the master. It can even determine the position of the person in a society. Sana is a girl from the esteemed Minatozaki, an aristocratic family known for their success in summoning high level Guardians throughout the years. She is the oldest daughter of the twelfth generation of her family and is set to attend the most

Minatozaki Sana has trouble dealing with men. To help her eradicate this problem, her two friends made her confess to someone as practice. But what if that someone unexpectedly agrees...