Spoiler-Safe Summary

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While Tanjiro and his friends train to improve their skills, their opponents gather to prepare for their next dangerous move, signaling an impending new mission that will test their growth.

Full Plot Summary

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After Rui's death, Muzan summons the remaining five Lower Ranks to an interdimensional castle. Angered by their weakness, he kills them all but spares Lower One Enmu, strengthening him with his blood; Muzan also incentivizes killing Tanjiro. The trio are assigned to join Kyojuro on a train to investigate its disappearances. He farewells the mansion’s inhabitants, including Kanao, who after explaining her process of flipping a coin to make personal choices, Tanjiro convinces to instead listen to the voice of her heart and decide herself, leaving Kanao smitten by his kindness. The three arrive at the train station and jump onto the train as it leaves, which has Kyojuro and Enmu on board.