Touma Inaba, a candidate for the entrance exam at Keio College (a top-tier Tokyo university), is interrupted when Urara Kasuga, a cute young girl, arrives at his hotel room door. She later turns out to be his cousin, whom he barely remembers from his childhood. Urara, who has felt something special for him (a love beyond that of cousins), invites Touma to live with her since he has nowhere else to stay but the hotel room. Before taking the test, Touma meets Meiko Yotsuba, a beautiful, sophisticated woman who is also trying to get into Keio. Meiko gets into Keio, but Touma does not, because of a cold Urara had given him shortly before. Although he did not make it, he pretends he did to earn Meiko's respect. Touma is caught up in a love triangle with Urara and Meiko, while struggling to keep Meiko believing he is really a Keio student and still be there for Urara at the same time.