At first, he appeared to be the only survivor (though it's later revealed that Sōshun Murasame had survived as well). In the end, Asukasei seemed to cause his own demise; he was approached by Izuru Kamukura, who warned him and appeared to have no intention to harm him. However, despite this, Asukasei decided to attack him. This lead to Izuru striking him against the wall in self defense, which indirectly caused Asukasei's death, as the boy fell on his own chainsaw and had his head mostly severed.
Asukasei has short dark-colored hair and reddish brown eyes. He wears glasses and the standard Hope's Peak Uniform with a bright turquoise tie.
Asukasei appears to be a serious person, not seeming to smile much even in ordinary situations. Despite appearing relatively calm during the beginning of the Killing Game, he quickly becomes aggressive and panicked once the fighting begins, as shown with his screaming assaults on Tomohiko and Aiko.
By the end of the Killing Game, Asukasei has become completely unhinged, laughing madly and mocking the dead victims after he assumed he was the only survivor. However, he also vomits in shock and disgust, implying that he is still driven by fear and desperation. His newfound paranoia is reinforced when he blindly attacks Izuru, despite the Ultimate Hope simply warning him and showing no aggression towards him.
Junko Enoshima gathered all of the Student Council, and Izuru Kamukura in the old Hope's Peak Academy building. He was irritated that they had to gather so late at night, but his annoyance gave way to shock and horror when the killing actually began. When Karen Kisaragi started the Killing Game in earnest, 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, severing most of his neck from his body. Before Asukasei died, he managed to fire a shot that grazed Izuru's right cheek.
- His given name, "Asukasei" (明日晴) possibly translates to "clear tomorrow."
- His surname, "Hino" (日野) means "sun field."