Zenitsu Agatsuma vs Tongue Demon

Zenitsu Agatsuma vs Tongue Demon was a battle that took place in the Drum House. It focuses on the battle between Demon Slayer Zenitsu Agatsuma, against the Tongue Demon.

Prologue
As they walk around the Tsuzumi Mansion, a clearly terrified Zenitsu can been seen holding Shoichi's hand as the duo attempt to find a way out. Calling out to Zenitsu, only to be told off by the latter for making a loud noise Shoichi tells Zenitsu how he feels unsafe around him, especially considering how frightened Zenitsu was. Zenitsu profusely apologizes and tells him that they should stay quiet to avoid being attacked by Demons, just as the Tongue Demon appears in front of them.

Zenitsu now much more terrified than before, desperately tells the demon to stay back, additionally that saying neither he nor Shoichi would taste good as they begin to run away. The Demon simply responds by saying that he would not know how they'd taste if he didn't try, proceeding to chase and attack them.

After running into a room, Zenitsu collapses from fear and tells Shoichi to escape and leave him, however, the young boy immediately refuses and Zenitsu is further pressured with his responsibility to save Shoichi. As the Tongue Demon approaches them, Zenitsu falls asleep from both his fear and the tension of the situation. Shoichi begs him to wake up just as the Demon lashes out its tongue.

Battle
Being an unexpected gesture, the Demon's tongue is cut as Zenitsu stands with his head hung low as his subconscious is now sustaining him. Now moving into the stance for using Thunder Breathing, First Form: Thunderclap and Flash, Zenitsu gets ready to decapitate the Demon without hesitation. With one swift move, Zenitsu easily goes through with his plans and now stands victorious against the demon in battle.

Aftermath
Shoichi gapes in shock looking at Zenitsu as he wakes up and screams at the sight of the deceased Demon's now decapitated head. The confused Demon Slayer misunderstands the situation and begins to express extreme gratitude towards Shoichi for "saving" the pair, also telling him he should have let possessed extreme strenght much earlier on. Shoichi, now at a loss for words and decides not to say anything, telling Zenitsu they should go.