Sasuke's Rinnegan

"Honestly, it's a little complicated." Naruto scratched his head, unsure how to explain it to Rock Lee.

"Basically, you sense Kakashi-sensei's Chakra, then use your own Chakra to mimic his cells. After that, you use his cells to form an eye and heal him."

Naruto explained it with great confidence, but Rock Lee hadn't understood a word. It was strange: he could understand every word on its own, but put them all together, and he couldn't make sense of any of it.

Rock Lee was completely bewildered and had no idea what Naruto meant. But that didn't matter, as long as Kakashi-sensei was all right. He breathed a sigh of relief, then said, "Thank you, Naruto."

"No problem, haha." Naruto laughed, saying it was only natural for him to help and there was no need to thank him.

Rock Lee shook his head and looked at Naruto solemnly. "No, Naruto, you don't understand. Teacher Kaido is like a second father to me. I wouldn't be who I am today without him. He's the one who made me who I am."

As Rock Lee spoke, he could no longer hold back his tears. When he'd been told he had no talent for being a ninja and would never become one, Might Guy had pulled him out of the depths of despair.

He'd taken Rock Lee on as his student, guided him every step of the way, and taught him the Eight Gates and Konoha Taijutsu. Without Might Guy, Rock Lee wouldn't be who he was today. In his heart, Rock Lee had long since come to see Might Guy as a father.

With Guy on the verge of death, it was impossible for Rock Lee not to grieve. Naruto had pulled Guy back from the brink. Even if Guy could never