Otsuichi is pen name of Adachi Hirotaka. He is an author, mostly of horror short stories. There are two patterns in his literary style, cruelty and heartbreaking. He got the JUMP Novel Grand Prix by Shueisya when he was seventeen and he debut at the same time. "Summer and Fireworks and My dead body" is his first work. His two literary style is called "White Otsuichi" and "Black Otsuichi" among his fans. "Goth" is the most important work of "Black Otsuichi" and "Calling you" is the most important work of "White Otsuichi". "Black Otsuichi"'s work is very cruel and ghastly but "White Otsuichi"'s work is very delicate and heartbreaking. I think he is versatile because he can distinguish black and white in writing.