There is only one student that gets 100 on every test and exam that he takes, and his name is Fuutarou Uesugi. Uesugi puts everything that isn't study related on hold, that being said he leads a rather tough life. His personality is very standoffish and he'd rather be a recluse than have a social life at all. One day during lunch Uesugi starts argueing with a new female transfer student over her trying to take "his seat" in the cafeteria. This arguement leads them into disliking each other. That very same day, he is presented with an "almost to good to be true" opportunity to clear his families debt. He has to private tutor a wealthy family's daughter, with the wage of five times the market price! He accepts the proposal, but is horrified to find out that it is none other than the same girl he had an arguement with earlier in the day, Itsuki Nakano. After unsuccessfully trying to patch things up between them, he also finds out that she is a quintuplet, and must tutor them all.