Due to the high suicide rate among youths in Japan, the government implements experiments to uncover the causes behind the high suicide rate. Children are selected and placed in a YSC facility under constant surveillance. At the age of 10, the children are then give a detonator with a red switch. They are told if they press the switch they will die immediately. Most of the children under the experiment, eventually presses the switch and dies. After the completion of the experiment 6 kids remain who did not press the switch. The 6 kids are; strong-minded Masami, weak Naoto, hot-tempered Hiro, impulsive Ryota, wheelchair bound Kimiaki and Aiko who is always thinking of her parents. These 6 kids survived even though they were pressured by project manager Tsukuda to press the switch.