Transmigrated in Uchiha Clan with Sign-in System Start with Rennigan

For the usual Uchiha Kouki, this would be a fatal situation. But now, with his cheat, he didn't care about these two.

"Kid, why aren't you running? Given up?" one of the chunin sneered, a cruel smile on his face.

"Hiyaga, he's an Uchiha. Don't underestimate him!" the other chunin warned, frowning. The Uchiha Sharingan was famous. Even a genin might have it. What if he awakened it during the fight? Recent intel from Iwagakure reported an Uchiha genin awakening the Sharingan at Kannabi Bridge and killing many. Iwagakure was wary of the Uchiha.

"Earth Release: Earth Spike Jutsu!"

Hiyaga, despite his taunts, wasn't careless. He made hand seals and shouted.

Hiss hiss hiss!

Earth spikes erupted from the ground, surrounding Kouki. This jutsu was powerful Kurotsuchi had used it to break Naruto's shadow clones. Kouki, a genin, might not be able to dodge it with the Body Flicker Technique. Genin jutsu is weaker than chunin jutsu.

But Kouki didn't need to dodge. His eyes changed, revealing the Rinnegan. A repulsive force lifted him into the air.

"What...? What is that?"

Hiyaga and his partner were shocked. Could he use Onōki's Super Lightweight Rock Technique?

"Almighty Push!"

Before they could figure it out, Kouki raised his right hand. A powerful suction force pulled them towards him.

Clang! Clang!

Two sounds of flesh being pierced. Hiyaga and his partner were impaled by black rods through their hearts. Their eyes widened in disbelief. Two chunin, killed so easily by a genin.

"Easy work against two chunin. The Rinnegan is amazing," Kouki said, landing.

But he frowned. "Killing two chunin, using Almighty Push and two black receivers... cost me 20% of my chakra!"

The consumption was far greater than he expected. He couldn't fight long like this.

"Wait... I'm Uchiha, perfectly compatible with the Rinnegan. I shouldn't be burdened like Nagato... No, I used the Rinnegan without problems. The problem is, I'm a genin! My chakra reserves are too low!"

He understood. As a genin, his chakra was limited, and the Rinnegan consumed a lot. He was low on chakra.

"I thought I'd be invincible in Shippuden, but I was wrong... I need to play it safe for now."

He decided to be cautious. He could handle jonin, but not Kage-level opponents; his chakra wouldn't last.

Kouki tossed the bodies aside and used Transformation Jutsu, changing his appearance. Then he returned to the battlefield.

He couldn't ignore Shisui. The village knew Shisui was searching for Obito's body. If Shisui died and Kouki returned alive, it would be suspicious.

Plus, he wanted to test the Rinnegan's power further. He'd help Shisui if needed, but only if it didn't endanger him.

When Kouki arrived, the battle was almost over. Konoha was losing badly. Only Shisui and Kakashi were left, and Kakashi was badly injured and captured. He had Obito's Sharingan, but couldn't use it yet. Even if he could, the enemy was too strong.

Shisui, using his Body Flicker Technique, created four clones, facing Han.

"Shisui of the Body Flicker, truly deserving of the name!" Han said, impressed. He hadn't found the real Shisui yet.

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