Chapter 12

I Cannot Say (えない) is the twelfth chapter of Koyoharu Gotōge's Kimetsu no Yaiba.

Summary
The chapter begins with Nezuko stomping and pursuing the Swamp Demon, despite her brother's commands. She returns to him after evading the demon, but Tanjirou is immediately dragged into the ground and yells at her to protect both Kazumi and Satoko.

After entering the bog, Tanjirou discovers the numerous personal belongings of the victims including kimonos, shoes, and pouches. The demon quickly maneuvers around the bog taunting Tanjirou and moves in to attack him, however Tanjirou is able to overcome the circumstances and manages to kill the demon using the Sixth Form Whirlpool technique.

As Tanjirou begins his escape from the bog, Nezuko is seen above the surface facing one of the Swamp Demon's forms. The demon acknowledges her strength and abilities but still manages to slash Nezuko across the face, and then attempts to kill her. However, before the demon can land the fatal blow, Tanjirou emerges and slices the arms off the demon while threatening him not to lay a hand on his sister.

Tanjirou quickly subdues the demon and disgustedly asks how many humans the demon has killed. The demon insists that he should be thanked for killing all the young girls before they rotted with age, angering Tanjirou into slashing the demon's mouth. The chapter ends with the demon looking up to Tanjirou in fear as he demands information regarding Muzan.

Characters in Order of Appearance

 * Kamado Nezuko
 * Swamp Demon
 * Kamado Tanjirou
 * Kazumi
 * Urokodaki Sakonji
 * Hotaru Haganezuka