On the night of his father's funeral, Yamato came across a good-looking man called Onodera. After noticing Yamato, Onodera stated, "You must be sensei's son; you look a lot like him." Nevertheless, Yamato was caught off guard when Onodera suddenly planted a kiss on him while they were tidying up his father's possessions during their next encounter. This event made Yamato question whether he was merely a substitute for his late father in Onodera's perspective.