Fuutrou is an honors student, however he is a poor, second-year high school student. In order to help his family pay back their debt, he accepts a private tutor job that comes with good working terms but... Fuutarou is the type to march to the beat of his own drum and doesn't care about the opinions of others.

Ichika is the oldest of the quintuplets. She’s the older sister-type who is good at looking after others, but she hates doing anything around the house and her room is filthy. She is currently keeping something secret from her sisters.

Nino is the second daughter of the quintuplets. Even though she is the one who cares the most about her five sisters, she is very aggressive verbally and physically towards Fuutarou. Nino is good at cooking and is in charge of meals for the Nakano household.

Miku is the middle child of the quintuplets. She doesn’t say much and is the calm type, but she can go down a rabbit hole when it comes to old war generals. Miku is great at disguising herself as her sisters and sometimes will pass off as one of them at their request.

Yotsuba is the fourth youngest of the quintuplets. Overflowing with energy, she gets along well with others and cannot refuse a friend in need. She is the best at sports for the five and often helps with sports clubs at school.

Itsuki is the youngest of the quintuplets. She is the serious one and the hard worker of the five, but often fails to produce results with her clumsy personality. She loves eating and is also the glutton of the family.