Utopia is a song that was specially created for the True Tears x Hanasaku Iroha x Tari Tari Joint Festival Live featuring the seiyuu (voice actors) from the three series. P.A. Works produced a video of this song which is included in the the Blu-ray release of this event.
Watch true tears × Hanasaku Iroha × TARITARI: Utopia episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.