Ryuunosuke has a beautifully simple mind that wishes to seize one point to its very limit.[2] He is obsessed with the process of death and dying. He thinks that humans are inherently curious in death like a sort of forbidden knowledge and try to understand it by observing other people's death, and make up a virtual experience, so that's why he became a murderer.

According to him, claims that depiction of cruelty in fiction has a bad influence on young people are ridiculous nonsense, because if blood and screams in splatter horror had been at least a little more realistic, he wouldn't have become a homicidal maniac. He is satisfied by squeezing the best out of the life force of those he kills, of feelings such as the attachment for human life, anger and affection. To let his victims know the exact time and circumstances of their death, that in itself had a deep meaning as rich as a miniaturized life and the more he killed people, the more he understood the lives he took. That knowledge, that discernment in itself was a kind of dignity, a style that in his distorted logic, he considered as something "cool".[5] With his death, his last thoughts were the brightness and vibrance of his lifeblood and the excitement as he experienced his own death.