Masafumi is one of five new recruits, three of whom he associated with, they were likely co-workers and seemingly died in the same manner. How they died is unknown, he alongside Jouji Morozumi, Manabu Yamaguchi and Houchuu Nagashima join the Tokyo Gantz Team before undertaking the Oni Mission. Kei Kurono convinces them to wear the suits for their own protection saying that they would be able to go home if they did. They change without arguing and Kei warns them about the battlefield they are about to walk into and that not all of them will survive. After arriving in Ikebukuro the four men discuss if they should leave or not but Kei stops them before they can. Reika takes them to find an Oni alien but upon being found out and confronted it transforms, Reika shoots it, taking off its arm. It