Kotaro is an absent-minded genius in Chinami's class. He serves as the head and sole member of the Science Research Club, and he can always be found in the club room. He is very interested in Chinami's ability, though he has not shown any romantic interest in her so far. He is also quite dense regarding Sonomi's feelings for him. However, in episode 12, he realizes that he loves Chinami, thanks to Sonomi's help.
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