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Ohtani (40), who just became a professor in the spring, is a bit of an indifferent adult who is indifferent to anything other than his own research.
As he is taken care of by Kobayakawa, who belongs to a seminar, he becomes aware of his feelings.
For several years after his wife died, Ohtani thought that he would no longer feel the same feelings as he did at that time, but his feelings for Kobayakawa were indeed 『 Koi 』.
This is his second love of suffering from an unfamiliar experience.