An emergency arose with a powerful demon, prompting several demon slayers, including the Hashiras, to respond. Backup slayers handled other demons nearby and then joined the Hashiras. Expecting them to have defeated a specific demon, the other slayers were shocked to see the Hashiras struggling.
Demon Slayer #1: “Are the Hashiras struggling…?”
Demon Slayer #2: “This is bad…”
Demon Slayer #3: “That demon must be over-powerful if it’s making the Hashiras have a hard time.”
The demon the Hashiras fought had a powerful Demon Blood Art called "Musical Waves." Using its singing voice, it launched harmful musical notes that made it difficult for the Hashiras to approach. The demon also wouldn't stop talking, making the fight even harder.
Demon: “Give up, you mediocre humans! You can never get pass my notes! Not unless you reverse the technique onto me!”
The demon slayers watched with worry and fear as the Hashiras dodged the musical notes. Realizing the key to victory, the Hashiras understood they had to sing to reverse the notes, as none of their breathing forms were working.
Mitsuri: “That’s it!”
Tengen: “Everyone get ready.”
Both the demon and the slayers were confused by the Hashiras' actions. As the Hashiras continued swinging their swords at the demon's powerful musical notes, they finally understood what they had to do.