They always scroll at him for falling asleep in class. They call him a slacker. All of them think he doesn't want to pay attention. Yukio always says he sleeps to much, that he should focus more on his work. But no one of them know what's like to be awake until the sun begins to rise. But he guessed he sleeps when he is dead. #1 in OkunuraRin (04.03.19) #31 in AoNoExorcist (26.03.19)