Naruto: I Just Want to Use a Little Cheat!

[No conspiracy theories + The person who respects Danzo the most + Guided by a jounin instructor, not made up on the fly]

Fenghe Rili wakes up one day and finds himself transmigrated into the Naruto world.

The good news: the Ninja Academy graduation exam is happening that very day, so he's arrived right on time for the plot.

The bad news: he's a modern-day shut-in who can't do a thing.

Just as he thinks he's about to earn the achievement "The First Transmigrator in History to Fail the Clone Technique and Repeat a Grade"...

Ding! The Ninjutsu Analysis System has activated!

As long as he watches someone perform a technique, the System can analyze it automatically.

Watch a few more times? He can copy it perfectly at 100%, and even improve and upgrade it along the way.

And so Fenghe Rili begins his ninja career: no grinding, no spending, just sharp eyes. Naruto uses Multiple Shadow Clone Jutsu? He takes one look and learns it.

Kakashi uses Lightning Blade? He watches a few times and learns that too.

Zabuza uses Water Release? He crouches in a tree and observes in secret...

Orochimaru uses a forbidden technique? He hides in a corner and secretly analyzes it...

Fenghe Rili says, "So what if I use a little cheat?"

Wait, why did the System upgrade again?!

It unlocked a ninjutsu fusion feature? You can use ninjutsu like this?

Fire Release: Great Fireball Technique × Wind Release? Could this combination be...