Yukiteru's father, who is divorced from Yukiteru's mother due to an unpaid debt of three million yen, initially shows up in chapter thirty, claiming he just wants to check on his son. However, it turns out that his true intention is to destroy Yukiteru's diary as part of a deal with the Eleventh. Despite his primary goal being to rid himself of his debts, he does attempt to save Yukki when the latter nearly falls to his death. Yet, he takes the parachute away from Yukki before the tower collapses shortly after.
He then stabs his ex-wife when she tries to take him to the police and manages to escape. Nonetheless, he meets his demise two chapters later when he is stabbed to death by the Eleventh's men.
