Erena Mizusawa

A police detective Shoukokuji Ryuuya from the first section of Metropolitan Police Department is tasked to investigate the murder case of a woman which takes place at a grand party held by a big-time actress but faces the hurdle of finding the true culprit among the large pool of suspects.

A história gira em torno de uma jovem de 21 anos chamada Suzuki Saya, funcionária de um escritório. Saya nunca esqueceu o seu primeiro amor da época do colegial e por isso não quer se relacionar com ninguém. No entanto, as coisas mudam quando o seu supervisor Tsuge Susumu confessa seu amor por ela.

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.