She was his best friend that he grew up with, and she afterwards became his initially girlfriend. He was planning to start a relationship along with his classmate, Natsumi Kogahara. But Abruptly, he swapped his entire body along with his ex-girlfriend, Lemon Nishikawa. Premise: After his fight with Magia Lupus, https://www.intensedebate.com/people/trescakowalk