Sen'ichi Kurashige

Age 31. A science teacher and the homeroom teacher of Kyo's class. He is also the advisor for the swimming club. Nicknamed "Jellyfish." He sports a scruffy beard and his classes are rather lackadaisical, far from being passionate. Sen'ichi (船一) was named by Asanuma, who played Kyo.

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He has a crush on his colleague Mizusawa and repeatedly makes subtle advances. As the summer vacation approaches, his efforts start to pay off, and by the end of the summer break, he successfully proposes and gets engaged.

In the movie "ADP," he remembers his pre-quantum server existence as a quantum server researcher and regrets the overestimation of their research. Although he continues his research to break the current situation, he can't endure the endless loop any longer and asks Shima to reset his memory after the last loop where Funaberi was lost.