The murderer is...

Yukie Nakama

Kurumi Hatakeyama

Pinko Izumi

Hanako Sakura

Ryu Si-won

Park Ji-Won

Koji Ohkura

Kosuke Yoshii

Toru Masuoka

Koichiro Aoyama

Michiko Kichise

Haruka Ninagawa

Shunsuke Sawada

Naoyuki Yoshimura

Takashi Yoshida

Toshiya Sato

Nagisa Katahira

Momoe Iwashiro

Tetsushi Tanaka

Takahiro Yanagida

Shinya Irie

Tsutomu Shiose

Yoshihiko Hakamada

Satoshi Honda

Kosuke Suzuki

Jun Takagi

Noboru Kaneko

Takuya Kawaguchi

Takashi Sakurai

Masato Sakurada