AppearanceYumi, and is usually seen wearing the Hinomori High School uniform. Yumi usually calls her "Mitchon".
Mishima has a childish, cheerful, and playful personality, yet is still caring for others. This is seen by how worried she was when Yumi got into an accident and how grateful she was once she found out Yumi was safe.
Mishima is always seen together with Yumi wherever she goes. At the school entrance ceremony, when Yū gives his speech as the student representative, Mishima whispers to Yumi who was sitting in front of her. She says that Yū is quite cool, which Yumi easily agrees to.
After school, as they were waiting to cross the street, Yū uses his ability to construct an accident to save Yumi. He takes over Mishima's body and runs away from Yumi. Once back in his own body, he possesses a truck driver and attempts to hit Yumi, switching back into his body just a few seconds later to save her. Mishima then runs back to her best friend while sobbing, and is grateful towards Yū.
Later after Yumi's leg has already been bandaged, Yumi asks Yū if he could join her and Mishima to go to their favorite pancake cafe. Mishima, who realizes that it is a chance for Yumi to develop a relationship with him, makes an excuse that she must go home soon, and leaves both Yumi and Yū alone.
|Main Characters||Yū Otosaka • Nao Tomori • Jōjirō Takajō • Yusa Nishimori • Misa Kurobane • Ayumi Otosaka • Shunsuke Otosaka • Takehito Kumagami|
|Supporting Characters||Maedomari • Medoki • Shichino • Furuki • Sala Shane • Kazuki Tomori • Yumi Shirayanagi • Tsutsumiuchi • Konishi • Udō • Arifumi Fukuyama • Saitō • Iori Sekiguchi|
|Minor Characters||Mishima • Kōta • Shō • Nomura • Oikawa • Sugimoto • Takato • Yoshiyuki Ōmura • Mrs. Tomori • Gondō • Hosoyamada • Mr. Kurobane • Mrs. Tomori • Honoka|