When Keitaro was little, he made an oath to his childhood sweetheart. He promised that when they grew up, they would go to Tokyo University together and be happy. Alas, she moved away a short time after. Keitaro is now college age. The problem is, he had already forgotten the name of the little girl he had made the promise to! To top it off, he also flunked the Tokyo U entrance exam. But Keitaro's luck is about to change... for his grandma just granted him every hot-blooded guy's dream job -- to be the manager of Hinata Sou, an all-girl dormitory! The roster of tenants includes the studious and rather violent Naru, another Tokyo U hopeful; Kitsune, who's mainly interested in money, parties, and making mischief; Motoko, the short-tempered turtle-phobic kendo master; Shinobu, the shy junior high student who's also Hinata Sou's resident cook; and Kaolla, the mysterious foreigner who's fond of inventing various mechanical gadgets. Could one of them possibly be the girl Keitaro made a promise to fifteen years ago? More importantly, will Keitaro succeed in his third try for Tokyo U?