Susumu Yasumori is the son of Nao and Mikiyasu and Tokujirou's and Setsuko's grandson. He is the youngest Yasumori. As he was sleeping, he was bitten by Nao, woke up, and called out to her which Mikiyasu heard. Later, he went into cardiac arrest, and died. Toshio Ozaki tried to revive him, but to no avail. Later, he and Mikiyasu were taken to Mizobe hospital. He doesn't rise up and stays dead. He is the third Yasumori to die.