Heart of Darkness - Chapter 239 Who are you?

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.

Traversing to Naruto World on Monday, as long as you sign in, you can get the other party’s ninjutsu, ninja tools, and bloodline boundaries. After the good impression is full, there are all kinds of surprises!

Kai: Where did I go to this kid to learn Bamen Dunjia!

Obito: Damn, how can this kid be so powerful!

Nagato: Shinra Tianzheng! Are you interested in going to Konoha for a double yellow bullet?

Hashima: Come on boy! Thousands of hands beat each other!

At this time, Monday stood in front of Kaguya Otsutsuki with a charming smile.

Kaguya will sign for me.

- Description from novelbuddy

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.