Koudai Yamamoto 山本幸大

Height: 172 cm (5'8")

A Sakuragaoka High School student in Class 1-1, and a friend and member of the "Idiot Trio" consisting of himself, Kotaro Enomoto, and Ken Shibasaki.

Of the Idiot Trio, Kodai is by far the most levelheaded member. He's not one to lose his head over minor inconveniences, but does make his anger and displeasure known in subtle ways, such as a change of tone or sarcasm. Otherwise he's quiet and out of the way, watching everyone from the sidelines. Has a calm personality.

In addition, he's attentive and willing to hear his friends and others out. Whenever Ken or Kotaro have the chance to talk to him alone, they always end up spilling out their thoughts, and he's ready to provide support or an answer to their worries.