Rui Kamishiro is a criminal who was caught and is about to be interrogated by investigator Tsukasa Tenma. Rui is a high school student who is quite smart for his age. He is a talented inventor, and he uses this talent not for the best. Illegally creating various explosives and dangerous inventions. He kept them in his workshop.Rui sits in handcuffs. He is strangely calm and claims that there is nothing dangerous about it. He is playful and frivolous and can easily avoid questions and become 