Kimetsu no Yaiba: Stories of Water and Flame

Gaiden is a volume consisting of the Giyu Tomioka Gaiden and Kyojuro Rengoku Gaiden. It is written by Koyoharu Gotōge and illustrated by Ryōji Hirano.

Chapters

 * Giyu Tomioka: Gaiden (Part 1)
 * Giyu Tomioka: Gaiden (Part 2)
 * Kyojuro Rengoku: Gaiden (Part 1)
 * Kyojuro Rengoku: Gaiden (Part 2)