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Masamune Izumi (和泉 正宗)Izumi Masamune is the protagonist of the story. He is a novelist that goes by the pen name "Izumi Masamune," his same name. He started out his novels in middle school after winning a light novel writing contest. He hopes to get closer to his Younger Step-sister.

In chapter 5, Izumi admitted and confessed his love for his sister but was rejected.