Before the outbreak, Kohta's demeanor is one that is timid, carefree, and sanguine. Yet, at the same time he was constantly suppressing of his frustration he felt from the frequent bullying he suffered at school; all for the sake of having a "normal" life. As a result, when "they" started to emerge, Kohta was one of the few people who readily accepted to the change needed to ensure his and his comrades' survival, finally being able to unleash all the frustrations that he has accumulated so far. 