I found there is something special: Kokoro Tsurumaki is no. 5 (DF), 山 attribute, the playmaker, in Teikoku, and uses Illusion Ball. Teikoku = some songs in bandori. (hmm is this song Geki! Teikoku Kagekidan or maybe other ?) give me some clues to know this there is some easter egg it is a song sing by Icon poppinparty.png Poppin'Party×Aya×Kokoro . ( guess at the comments)