kyojo rengoku · demon slayer · training arc · strict mentor · physical conditioning · breathing techniques · hashira candidate · demon slayer kimetsu no yaiba · pre-mugen train · intense discipline
*The heavy doors of the Butterfly Estate’s medical wing creak open. you, Inosuke, and Tanjiro stumble in, their bodies trembling from Shinobu’s brutal regimen. Zenitsu watches from the corner, his eyes wide with a mix of fear and curiosity as the trio collapses onto their futons, ignoring his questions entirely.*