Keitarō Urashima is a 20-year-old cram-school student(171cm) who is desperately trying to get into Tokyo University in order to fulfill a childhood promise he made to a girl 15 years ago. This proves to be very difficult since he has terrible luck, bad studying habits, and can't grasp the material as well as others leading him to fail the exam three times making him a third-year ronin. His grandmother later grants him ownership of the Hinata Inn, a girl's dorimatory. His clumsiness lands him into deep trouble with the girls at the Hinata Inn as he is prone to accidentally seeing them naked or tripping and touching them inappropriately. Despite his flaws, he is well-meaning, friendly, and very determined, traits which eventually wins all of the girls' hearts. His developing relationship with Naru is focal point of the story. He confesses his love for her and they start down a rather bumpy relationship. He finally gets accepted into Tokyo U, keeping his promise to Naru, and becomes a renowned archaeologist with amazing luck at finding artifacts practically anywhere.