A young boy and girl are playing together. The girl tells the boy that if two people meet and fall in love at the famous (Todai) Tokyo University, they will live happily ever after. The girl says that when they are older they should go to Todai together. Later on, the girl has to leave the town where the boy lives and she makes him promise that they will meet again at Todai.

Fifteen years later Urashima Keitaro (19 years-old, no girl friend, on his third attempt to get into Todai) receives a call from his grandmother to meet her at the Hinata Inn, which is run by his aunt. Keitaro wonders where everyone is. While waiting for his aunt to return, Keitaro decides to take advantage of the hot springs in back of the ryokan. Shortly after he begins his bath, one of the main recurring themes in this story manifests itself young woman, one Naru Narusegawa enters the bath. Keitaro is totally shocked. She does not seem at all shy. Unfortunately for Keitaro, Naru's vision is just not very good. When she realizes that something is wrong, she puts on her glasses and Keitaro is forced to flee for his life. In his flight he becomes well acquainted, not in a good way, with the rest of the all female occupants of this inn. We get to meet in order: the tricky, beguiling and teasing Kitsune (Kono Mitsune), and the amusing and mysterious foreigner Kaora Su.

As Keitaro is being driven out, his aunt Haruka, owner of the neighboring store and part-time overseer of Hinata Inn arrives. Keitaro hides behind her for protection and he finds out that his grandmother has gone on a long journey across the ocean, leaving the inn in the care of Haruka. Narusegawa doesn't want Keitaro anywhere near the house, no matter who his aunt is. As Keitaro resignedly begins leaving, Haruka mentions that he is a student at Todai now, isn't he? This draws a very strong reaction from the girls. Having someone as smart and as important as a Todai student in their inn would not be so bad! Keitaro tries to object and correct them, but he is unable to get a word in edgewise. Even the still angry Naru relents and agrees it would be okay for him to stay.