Yasuhiro is one of the more cheery, laid-back students, though a bit odd as well. However, he is generally not well-liked and he himself has openly admitted that he has no friends, being quite cowardly, lazy, slow-witted, and having a habit to act selfishly. He's quite gullible, and at first acts laid-back about the killing game, thinking it's some sort of a prank. However, after realizing it is real, he turns much more panicky.