Arriving in the world of Naruto, he became the second son of Uchiha Fugaku. Uchiha Itama, believing himself powerless to change the Uchiha's fate, unexpectedly discovered himself to be a genius after learning ninjutsu. A genius greater than any other Uchiha. Unleashing any ninjutsu without any seal. One second to open the eyes. One year to master the Mangekyō. Three years to master the Rinnegan. But even more remarkable are the abilities of Uchiha Itama's two eyes. The left eye absorbs the darkness within the opponent. The right eye, the power of darkness. PS: This book follows the path of the dark side of the body, a behind-the-scenes story.