Anime illustration: a flame-haired swordsman in a tattered white cloak with flame-patterned hems rests a hand on the head of a sobbing young man in a green chequered coat, amid the wreckage of a derelict steam train at sunrise.

Original artwork, not a still

Kyojuro Rengoku

Set your heart ablaze.

— Demon Slayer: Mugen Train • 2020

Behind the line

What it means

Our interpretation.

Rengoku's last act is to hand his courage to a boy who has just failed to save him, and the phrase turns grief into an order to keep burning. It suits a character who treats flame as his whole identity, from his name to his breathing style. Fans still use it as a motivational sign-off, and it is the line most associated with his death.

Context reviewed

In context

Spoilers for Demon Slayer: Mugen TrainShow the scene

At the end of the Mugen Train story, the Flame Hashira Kyojuro Rengoku has fought the Upper Rank demon Akaza to a bloody standstill as dawn approaches. Akaza tears himself free of Rengoku's grip and flees the rising sun, leaving Rengoku with a fist-sized hole through his abdomen. Rengoku calls Tanjiro over for a last talk, tells him to visit the Rengoku house if he wants to learn about Hinokami Kagura, and urges him to live with his head held high: "Set your heart ablaze." During the fight he had used the phrase on himself before his final attack.

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Context reviewed

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