Kohta is a 16 year old high school second-year student who was often bullied at school. He is a gun otaku (enthusiast) and has extensive knowledge of firearms and any military-related equipment that the group may come across. His skills as a marksman have proven to be a valuable asset to keeping everyone alive. He usually doesn't play a major role in the group's decisions and doesn't say much during discussions, but in combat situations he becomes much more involved with the others and helps everyone stay focused on battle. He is a vital part of the group's fighting abilities, so much so that Takashi Komuro once noted that, if Kohta died, the group would all be dead in a single day.