Digimon Ghost Game (2021)

S1E58 Pyramid

Ruli's former piano classmate, Kaoru, has vanished without a trace. As Ruli and her friends look for her, they stumble upon an unusual dent in the ground along with Kaoru's shoes. Their search leads them deeper into mystery when Hiro is unexpectedly posed with a cryptic riddle that could hold the key to finding her.