Anime: Not Completed
Manga: Completed

Genre:
Harem and romantic comedy

Plot:
High school student Futaro Uesugi is an academically gifted student that leads a difficult life — his mother has died, he has no friends, and on top of all that, his father has incurred a large amount of debt.

An opportunity presents itself when the rich Nakano family transfers to his school. Futaro is promptly hired as a highly-paid tutor. However, much to Futaro's dismay, he discovers that his five charges — identical quintuplet sisters of varied personalities — have no interest in studying at all and have abysmal grades. Some of the quintuplets are against having Futaro, whom they view as a stranger, in their apartment, but Futaro's diligent tenacity gradually convinces those girls to accept him and to improve their grades.

Throughout the series, Futaro develops special relationships with each of the quintuplets. Through a flashforward, it is revealed that he eventually marries one of the quintuplets, though her identity is not revealed until near the end of the story.