S1, E1: Yuuichi Katagiri and his friends, Tenji Mikasa, Shiho Sawaragi, Makoto Shibe and Yutori Kokorogi, live a simple high school life. One day, their school trip fund of two million yen is stolen. Amid all sorts of suspicions, they are suddenly abducted by a mysterious figure. Yuuichi and friends wake up in a strange room and before them appears an enigmatic doll that calls itself Manabu-kun.