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The male protagonist is a graduate student in the Department of Biology at school. He discovered a method to cure cancer during scientific research. He was approached by the female protagonist and asked to cure her father's cancer. However, he and the female protagonist were in a car accident and accidentally lost her blood. From this, he unexpectedly discovers that the heroine and his father can live forever. Since then, the fate of the two people has started a series of complicated grievances and resentments. There is actually an expert behind the heroine and his father. The hero only found out in the end that he was involved in a huge and carefully crafted conspiracy, but it was too late. . . .