During the dance segment, past-En has a mushroom headdress. The central part appears to be Wood Ear mushrooms, which in Japanese are called kikurage, the same as En's dog's name.
I just had a fun time with this special! It's nothing serious at all and holds zero impactful action scenes, but good, is it worth it! If you love the series as I do and just want more fun times with these characters, definitely give this a shot!
