Shinsuke has been going on with his uneventful daily life, with "synesthesia" being the only symptom differentiating him from others. He keeps the dark depth of his mind to himself, but feels distant even from his best friend and his fiancee. Mari has also been feeling deep solitude from experiencing synesthesia which she feels she is unable to share with anyone. Her parents have passed away, and her adoptive parents mysteriously die, one by one. Picasso, the "dealer of death" comes into scene as mysterious incidents and murder occur one after another. Shinsuke suspects that Mari is being followed by Picasso, and that she may be the next victim. Shinsuke and Mari's fateful meeting upturns their lives and leads them to tragedy.