A mathematics genius girl, Nina Machida, starts in a new school and attempts to find her elder sister, who vanished from that school one year ago.
Nina Machida
Sayuri Tachikawa
Kazuki Sato
Noa Miyashita
Rion Miyaeki
Rin Udagawa
Runa Jinnan
Haru Akasaka
Satoko Nakano
Mei Ōtsuka
Satoko Mita
Yuko Yotsuya
Takako Jingu
Mirai Azabu
Yū Meguro
Mina Hatsudai
Sana Nagata
Tomoko Harajyuku
Reiko Shirogane
Yuri Uehara
Manami Shibuya
Fuyumi Ōkubo
Satoko Komaba
Haru Maihama
Natsu Hatkeijima
Aki Daiba
Kai Yamashita
Riku Ōkura
Sora Tengenji
Ayaha Aoyama
Nagisa Toriumi
Kina Machida
Seiko Asakusa
