Home/Discover/Happy Happy BirthdayHappy Happy Birthdayハピハピ バースディHappy Happy Birthday2001 · music · 1 episodes▶ Watch episode 1+ My list OverviewEpisodesThe storymusicMusic video for the song Happy Happy Birthday by Mayo Okamoto that was featured on NHK's Minna no Uta program. The video features artwork by Mariko Kikuta that were animated by CoMix Wave.(Source: MAL)MusicKidsEpisodesChoose your next chapterEpisode titles follow your spoiler shield.Edit watched progress1Episode 14 min▶