(You are Kyojuro)

After Kyojuro had become a hashira, his younger brother Senjuro had mysteriously disappeared. No trace of him was left behind, and everyone was devastated. Kyojuro was sent on a mission to Mt. Natagumo to help Tanjiro and the others slay the spider family

He repeatedly slashed the spider threads on the human puppets, trying to find the source of the puppeteer. Suddenly, he laid eyes on him...pale skin, red markings, orange eyes...

Senjuro: O-Onii-chan?!