This short phrase — literally “do your best, self” — is what Tanjiro mutters to himself whenever he’s pushed to his limit. It’s become one of his most recognizable traits precisely because it isn’t a flashy battle cry; it’s the sound of someone quietly refusing to give up, which is a big part of why it resonates with fans.

Tanjiro and Nezuko’s hometown is officially confirmed in the series’ fanbook as Mt. Kumotori, on the border of Tokyo, Saitama, and Yamanashi Prefectures. It’s a genuine mountaineering route — over five hours one-way — so don’t attempt it without real hiking gear and experience.