After the meeting of the Upper Moons in the Castle of Infinity, Akaza went on his next mission from Mr. Muzan

walking through this dark and dense coniferous forest, which was illuminated by a large and bright moon, all Akaza's instincts literally screamed that someone was nearby...

and, passing by some abandoned woodcutter's shack, he smelled some familiar smell, so, slightly irritated by his curiosity, Akaza began to quietly sneak up to this shack