Naruto: This Is Definitely Not Genjutsu

A programmer in his previous life, he transmigrates into the eldest son of the Kurama Clan, a family destined to decline. Fortunately, just after transmigrating, he awakens the clan's Kekkei Genkai, the Manipulation of the Five Senses. When he discovers he has no System, a sudden idea strikes him: using programming techniques, Sealing Jutsu, and his clan's Kekkei Genkai, he creates an auxiliary System of his own. It can assist with combat and cultivation, and from then on, he no longer needs to form hand seals. He only has to issue commands to the System in his mind, and it can control his chakra and perform ninjutsu on its own.

He can also create five attribute-based phantom beasts by copying subsystems. They can absorb Natural Energy on their own and use ninjutsu in battle, while their bodies can freely shift between solid and intangible forms. From then on, Kurama Miyoru devotes himself to improving the System and lets it handle cultivation and combat.

As a massive fire dragon dives toward him, passes through his body like an illusion, and appears behind him, Shimura Danzō looks up, utterly baffled, and asks Kurama Miyoru, "Is this a genjutsu? ..."

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Please do not imitate.