[AU:School Life] Mai Taniyama is a Senior Class D student, Who hates class A's number one student, Oliver Davis, and is best friends with his twin brother, Eugene Davis. When her surrogate family is caught in a certain situation, she is forced to stay with her aunt's on and off boyfriend's colleagues who are… the Davises.

Oliver Davis had her figured out. He knew everything about her, from the length of her stride to the bounce of her hair. But there was one thing that perplexed the great scientist: the simple process that made her so unique. Sadness, then anger, then happiness. He knew what it was, he didn't know the 'why'. He couldn't figure out the Cycle of Mai. Until he went through it himself.