 In the Japanese language version, Tina Foster practices the well known song  "Happy Birthday to You" while walking with her groceries. Later at Aois  birthday party, everyone sings "Happy Birthday to You" to Aoi. In the English  dub the song "Happy Birthday to You" has been replaced with another tune with  some other lyrics. The song was changed so Pioneer did not need to license  the song for the English dub.