Mai's Sweet Valentine

Mai wants to recreate a chocolate cake that her mother made for Valentine's Day to give to her father. Meanwhile, Nechigae turns a shop assistant (Nonoka Ono) into the Negative Jeweler, Mune Kyunkyun. Miracle Tunes defeat her to recover the Cello Jewel. Afterwards, when Mai gives her father the cake, she discovers that he knows the song of the Crystal Melody Box and learns that the Goddess of Music, who had composed it, is her mother.