Kazu

Kazu is one of Satoru Fujinuma's primary school classmates and friend.

History
Although Kazu did not play a role in saving Kayo Hinazuki, he did play a part in saving Aya Nakanishi.

They first met when Satoru Fujinuma, Kenya Kobayashi and Hiromi Sugita were trying to impress Aya. During that time, Aya insulted their hideout by calling it childish. Kazu, then came out of his hiding place and defended it by calling it a "man's dream".

After that, Aya seemed to have been attracted to his "manliness" and spent a lot of time with him and his friends.

Trivia

 * His name is written in katakana, which has no special meaning.