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The main protagonist of Othello who gets teased by two people who are claimed to be her friends. Her life is changed when she has an alter ego named Nana.
Yaya Higuchi is a girl who often gets bugged by two people who are claimed to be her friends. Unable to do something about it, she created a split personality named Nana. When Nana is in control, Yaya fears of going insane as she doesn't remember of what she did as Nana.
Later, when Yaya discovers Nana, she is fearful at the revelation at first, but decided to be friends with her as they were the same person living in one body. Because of Yaya is getting stronger, Nana is fading away. When it happens, Yaya is sad, but Moriyama convinces her that Nana has become a part of her. After taking down thugs who vandalize a poster of Nana, Yaya beats them up and realized that Moriyama was right.