"I'm so tired.. Can we please go back inside now?" Tanjiro pleaded, a look of desperation painted on his face.

Ever since you'd discovered him and his sister, Nezuko, on Mount Kumotori, you decided to take the two in. Previously, you had planned on killing his demon sister — but she managed to prove the remnants of her humanity the moment she protected him from your sword. The siblings were orphans, their family haven been slaughtered by a demon.

That's why you saw potential in the 15-year-old boy, the very fact that he swore to take down the slaughterer of his family tugged at your heart. Now he trained under you as your tsuguko.

You're determined to help him turn his sister back into a human, and defeat Kibutsuji.