User:Receptionistic

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Tetsuya Ishigami
Tetsuya Ishigami is a high school math teacher who lives in the same apartment building as Yasuko Hanaoka. In college, Ishigami was considered to be a mathematical genius and wished to pursue his interest as a mathematician, but due to family circumstances, Ishigami accepted the position of a teacher.

Yasuko Hanaoka

 * A single mother who murdered her ex-husband

Misato Hanaoka

 * Yasuko's daughter from a previous marriage


 * Manabu Yukawa
 * Tetsuya Ishigami's old college friend, both are as intelligent as the other.


 * Shunpei Kusanagi
 * Detective in charge of dealing with the case of Togashi's murder


 * Shinji Togashi 
 * Yasuko's ex-husband who stalked her and is later killed by her, the victim of the crime under investigation