Change of Fate

Swordsmith's wrath

After a full day of rigorous training, Tanjiro, Nezuko, Muichiro, and Yuichiro sleep while maintaining total concentration breathing. But then when they stop, they were suddenly whacked by Kiyo, Naho, and Sumi, waking them up. Apparently, earlier they asked the three butterfly girls to help them with their overnight training. The next time they doze off to just sleeping, they would be violently woken up. The rest of their siblings could overhear it through the other room.

Takeo: (If this is how they'll train every night, I don't know how they will get any normal sleep.)

He thinks covering his ears.

Ten days later, they begin their rehabilitation training again facing Kanao and Nobara. But now they use Total Concentration breathing, they are able to finally beat them at tag and the reflex training. Zenitsu and Rui were indeed amazed at how their friends were progressing, but they glanced at Kaigaku, who was training outside practicing his thunder breathing.

Aoi: Don't feel pity on those who refuse to work with others.

Zenitsu: But he's my friend and brother.

Aoi signed in defeat.

Aoi: If you want to help someone who hates working with others, be my guest.

Zenitsu then looks outside seeing Tanjiro, Muichiro, Yuichiro, and Nezuko blowing into the small gourds breaking them, and again as the size gets bigger. Tanjiro, Muichiro, and Yuichiro were able to break the large gourd, but Nezuko however could not.

Later in the evening, he was called to Shinobu's office.

Shinobu: So, what do you think of your friends?

Zenitsu: Tanjiro and Muichiro are trying their hearts out. Their personality are the kind to care for everyone who has and had humanity. I guess that's why they pity demons.

Shinobu smiles remembering how Giyu found them after the death of Vasslex.

Zenitsu: Nezuko is the exact same. She would get angry seeing people die in front of her. She would refuse to forgive demons who would steal the lives of others. But during training, she feels distracted for some reason.

Shinobu then begins to feel she is to blame for that.

Zenitsu: And then there's Yuichiro. He feels guilty for not helping the demon slayers against the multiple spider demons and because of his anger issues, he's a bit reckless. And right now, they are constantly working hard to get stronger. They are my friends Shinobu. And I really want to help them, like how you and Kanae helped me and Kanao.

Shinobu stood up from her chair and whispered to her brother in law.

Shinobu: Then motivate them.

Before returning to the sun/moon mansion Tanjiro and Muichiro was asked by Zenitsu to follow him.

Tanjiro: What's going on?

Zenitsu didn't answer and showed them a hidden room. Inside was a single bed with a girl in her early twenties attached to medical equipment. Tanjiro and Muichiro were horrified.

Muichiro: How did this happen?

Zenitsu: She encountered one o the upper ranks of the twelve Kizuki. Before he could even finish her off, Shinobu claimed that the sun was rising, and he was forced to retreat leaving her in a near death state. So, to maintain her body she put herself into a Total Concentration Breathing coma. This was over a year ago.

Tanjiro then remembered that Nezuko had a talk with Shinobu the night during the time he was doing the Kagura Dance, how the insect Hashira's sister was left wounded.