The Mangekyou Sharingan

Kichi: Alright, use your sharingan now!

Renjiro's sharingan turns on(3 tomoe).

Kichi: Now, there is another state to your sharingan-

Renjiro: I have heard of it. I believe it's called mangekyou sharingan, right?

Kichi: Smart as always. You are right. You can achieve that state of eye by training hard, or very very intense emotional trauma.

Renjiro: Kichi Sensei, what is your kekkei genkai?

Kichi: You don't know?

Renjiro: You never told any of us.

Kichi: I have senjutsu absorption.

Renjiro: Isn't senjutsu used for sage mode?

Kichi: Absolutely, and I will say no more. Alright, I gotta go! Keep practicing. Also, if you unlock the mangekyou sharingan, watch out. If you use it enough you will become blind. So you will need the eyes of a relative to get the next version.

Renjiro: Which gives you the eternal mangekyo sharingan.

Kichi: Which will never make you go blind. Alright, enough with the history lesson. See ya kid!

Kichi leaves.