The Kamado siblings follow Obanai to a mysterious building.

Obanai: Welcome to my home. I will be your sensei in order to make you great slayers. In short, in one sentence, I will teach you the Snake Breathing.

Tanjiro: How do you kill demons?

Obanai: It's very simple. You must either expose them to the sun or decapitate them with a sword like mine.

Nezuko: What is the Snake Breathing ?

Obanai: It's a special breath if you have several opponents.

Tanjiro: Ok Mr. Nosebleed.

Obanai: Call me sensei! If I wear a mask, it's to hide an injury, you little idiot.

Tanjiro: Yes sensei.

Obanai: Let's start the little training.

The training is done in several parts: running with and without a katana, learning the Snake Breathing and reviewing your skills.

The running with and without a katana goes like this.

The Kamado siblings must first run at their maximum in 80 laps without any ammunition.

After this, they inform Obanai of their performance if they succeeded or not. If they fail, they do 129 push-ups and 90 sit-ups.

I'm not going to lie to myself but Obanai is a little too strict.

Obanai: What do you mean "a little too strict"?! It's so that they survive the rest that I'm making them go through this.

I didn't know you were so worried about them. Especially Nezuko.

Obanai: Shut up! I don't like women who talk 24/7 like you.

Okay...

                                *

Obanai: Congratulations on the first test! Now let's learn the different movements of the Snake Breathing.

The Kamado siblings: Huh?