When Yūichi Ezaki notices a girl when he was hospitalized for hepatitis A. Rika Akiba is the same age as him and is residing in the east wing. After being encouraged by his nurse Akiko he decides to befriend Rika who is suffering from a very serious condition. Despite Rika's selfish personality Yūich begins to find himself being more and more attracted to her.
Knowing little about Rika's condition Yūich does everything he can to help her out. Yūich will just have to try not to get caught by his nurse or Rika's doctor for his antics of sneaking around the hospital and his nightly visits to his friends.