^Yes, this is the first Major/Official Single, as it is the first published under a records label (Zetima)
Before that, there were 4 indie singles (as they could only be bought at the events/concerts and the H!P Official Shops): Massara Blue Jeans, Soku Dakishimete, Ookina Ai de Motenashite and Wakkyanai (Z).
Later, they released a DVD (Cutie Visual vol. 1) with the PV's for Massara, Soku & Ookina, plus a live recording of Massara and Wakkyanai, and an album: Cutie Queen vol. 1, that included all four indie singles + 5 new songs. The DVD and the album were released by Zetima, thus, they are official.
Anyone, correct me if I'm wrong ^^