When Karen Kisaragi started the Killing Game, Asukasei fearfully picked up a gun and started shooting at Aiko Umesawa and Tomohiko. After he saw Tomohiko kill Aiko, he panicked even more and continued to shoot, but was knocked over and disarmed by Aiko's lifeless body. Tomohiko then proceeded to strangle Asukasei, but Asukasei stabbed Tomohiko in the neck with the same knife that was used to kill Aiko. Asukasei then got on top of Tomohiko and stabbed him multiple times.
Asukasei ended up being the assumed sole survivor after killing Suzuko with a handgun, but Izuru approached him and told him he couldn't beat him. Asukasei didn't listen and charged at Izuru with a chainsaw; in turn, Izuru pushed Asukasei and sent him flying backwards against a window. The chainsaw fell in front of Asukasei, and he fell on it, decapitating him. Before Asukasei died, he managed to fire a shot that grazed Izuru's right cheek.
