Kusatta Kyoushi no Houteishiki

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Arisawa Atsushi enrolls at Jougaoka High School to be closer to Shibata Masami, his childhood crush. However, unbeknownst to Atsushi, Masami no longer works there. Instead, it's Masami's brother, Masayoshi, who is now the school nurse. Mistaking Masayoshi for Masami, Atsushi is shocked by what seems like a complete personality change in his old crush. To make matters worse, Atsushi's friend, Inagaki Kouji, is constantly trying to get close to him, adding to his distress. Life at Jougaoka becomes a nightmare for Atsushi—until he starts to realize that maybe this new version of "Ma-chan" isn't so bad after all. He even begins to develop feelings for the way Masayoshi is now. That is, until he discovers that Masayoshi isn't actually Masami. - AnimeNewsNetwork

Associated Names

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Synonyms: Bad Teacher's Equation, Bad Teacher Equation, Rotten Teacher's Equation, Kiss me, Teacher
Japanese: 腐った教師の方程式
English: Bad Teacher's Equation

Official Webtoon

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Characters More characters
  • Atsushi Arisawa (有沢敦)

    Arisawa Atsushi

    Main

    Arisawa Atsushi enrolled at Jougaoka High School believing his first love, Shibata Masami, was a teacher there. As it turns out, Masami no longer works at the school, but his brother Masayoshi has taken over as the school doctor. Since they look alike, At...

  • Tooru Hagiwara (萩原透)

    Hagiwara Tooru

    Main

    Hagiwara Tooru is a math teacher at Jougaouka High School. Hes a shy and caring person, and is often called a teddy bear. Hes known the Shibata brothers since high school and has been dating the eldest, Shibata Masami, for just as long. When he met Masami...

  • Masayoshi Shibata

    Shibata Masayoshi

    Main

    Shibata Masayoshi works at Jougaoka High School as the school doctor and occasional substitute teacher. Outside of Jougaoka, he works as the owner of a gay bar that his father used to run, although its really in his older brother, Masamis, name. Hes loud ...

  • Masami Shibata (柴田まさみ)

    Shibata Masami

    Main

    Shibata Masami is Masayoshis older brother. He is kind and caring, always putting others, especially his little brother, before himself. When his and Masayoshis mother died their father moved with them to Japan, where Masami took it upon himself to take c...

  • Yuriko Hayase (早瀬由里子)

    Hayase Yuriko

    Supporting

    No biography written....

  • Kouji Inagaki (稲垣晃司)

    Inagaki Kouji

    Supporting

    Inagaki Kouji is a student at Jougaoka High School. He excels at sports and is constantly sought after by numerous clubs but he refuses to join any of them, instead devoting his time to chasing after Arisawa Atsushi, who he was childhood friends with. Whe...