A demon boy without horns on his head wields the cursed blade "Onikirimaru," the only weapon capable of slaying demons, in an endless battle against the demons haunting Japan during the samurai era. Behind the tales of Oda Nobunaga, Toyotomi Hidetsugu, Ishida Mitsunari, and other famous generals of the Japanese civil wars lie secrets and demons... An astonishingly deep story about these demons and the sword Onikirimaru! It also reveals the secrets of Onikirimaru's birth, which readers have long wished to know. The legend of Onikirimaru clearly explains how Onikiri was born and the hidden secrets of his past. Witness the battle between the darkness of the samurai age and Onikirimaru!