Naruto: I'm Nine-Tails and My Host is Kushina

Suddenly, a dark red layer of chakra engulfed Four-Tails' old purple glow.

With no option to move or hide mid-air, Roshi decided there was no point in holding back.

Clang, clang, clang—

The sharp sound of metal striking metal echoed as Four-Tails' Jinchūriki, Roshi, withstood Mikoto's scorching shuriken barrage.

It was the Tailed Beast Cloak.

Without hesitation, Roshi activated it fully.

"Now that's more like it!"

Since her opponent was finally showing his strength, Mikoto had no reason to hold back either.

The scarlet Three-Tomoe Sharingan in her eyes spun wildly before shifting. When the scene settled, twin black rings had taken their place.

"This is... the Mangekyō Sharingan!"

Roshi's eyes widened in shock. He never expected to witness these legendary eyes firsthand. Someone from the Uchiha Clan had actually awakened the Mangekyō Sharingan.