Tokusou Sentai Dekaranger/WMG

Umeko in childhood was a student in Remi Hoshikawa's class
Umeko's age would imply that she'd be of kindergarten age when Fiveman starts. In the first episode of Dekaranger, she sang the song that Remi taught to her students in the first episode of Fiveman. Which means, Umeko really learned that song from Remi.