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Kai Ichinose (一ノ瀬海)Birthdate: August 1
In the manga:
Kai Ichinose is perfect student. He lives with her mother, Ichinose Reiko, in a forest. Kai always studies with his teacher, Ajino Sosuke. At first, Kai hates Ajino, but since his mother says that Ajino is a perfect teacher Kai agrees to study with Ajino.