Konoha: Starting with the Tenseigan and Taking Over Team 7

You'd better thank me, you little brat.

That Yin Seal power you're using took your teacher four grueling rounds of hand-to-hand combat with Tsunade. I had to put my body on the line just to get it.

Honestly.

Tsunade was fierce.

Fiercer than Xiao Ming and Little Kurenai combined. She was practically a high-powered vacuum cleaner!

[Ding]

[Main Mission completed. Rewards: Rumble-Rumble Fruit ability (no side effects), eternal youth, and doubled lifespan.]

[New Main Mission unlocked.]

[Objective: Teach Naruto Uzumaki Sage Mode, teach Sasuke Uchiha to use Susanoo, and teach Sakura Haruno the Light-Weight Rock Technique and Added-Weight Rock Technique.]

The system said, "[Reward: Zanpakuto—Ryūjin Jakka (unlimited use at no cost; Bankai available).]"

Side Mission: Tsunade Comes Knocking

"This power... seems decent enough."

Aogetsu Hyuga clenched his fist. Milky-white light radiated from it, brimming with destructive force. He could clearly feel a new, surging power within himself.

So this is the power of the Tremor-Tremor Fruit?

Its overwhelming destructive force was fairly impressive.

But honestly.

The basic ability was nothing special. How strong a shockwave he could unleash depended entirely on how hard he could hit.

Still, it was a flashy power. He'd find a chance to test it.

Eternal youth and doubled lifespan were nice rewards too, especially eternal youth. His appearance would stop changing, and he could keep his handsome face forever!

As for doubled lifespan...

With the Tenseigan and Rinne Sharingan, his lifespan was already exceptionally long. Add the lifespan rewards he'd received before, and now it had doubled again.

How the hell am I supposed to calculate that?

How long can I live now?

Aogetsu Hyuga asked inwardly, "Hey, lousy system. How long can I live?"

The System Spirit replied, "[No. I cannot tell you. And I am a good system, not the lousy