Demon Slayer: Kimetsu no Yaiba, Vol. 4: Robust Blade

After a fierce battle with a demon inside a maddening house of ever-changing rooms, Tanjiro has a chance to find out about the fighter in the boar-head mask. Who is this passionate swordsman and what does he want? Later, a new mission has Tanjiro and his compatriots heading for Mt. Natagumo and a confrontation with a mysterious and horrifying threat…