On his first day of university, Ban Ritsuki was disturbed by a man who bumped into him and claimed that Ritsuki had a face he found appealing. Little did Ritsuki know that the man was Takagi Shoutarou, one of his professors, who began to stalk Ritsuki after their initial encounter. As Ritsuki grew more and more irritated by this unwanted attention, he happened upon Takagi gazing up at the sky with a mournful expression. This moment transformed Ritsuki's sentiment toward Takagi, and he found himself becoming invested in his well-being.
