Home/Discover/Since When?Since When?一体いつからSince When?2026 · music · 1 episodes▶ Watch episode 1+ My listWatch trailer ↗ OverviewEpisodesTrailerThe storymusicMusic video for the song Ittai Itsukara by Temari Tsukimura (CV: Nao Ojika).IdolMusicEpisodesChoose your next chapterEpisode titles follow your spoiler shield.Edit watched progress1Episode 14 min▶Official trailerA first look at the storyPlay trailer ↗More in this worldRelated animeTHE IDOLM@STERTV · 2011