There are a couple anniversaries going on for the YUKI YUNA IS A HERO franchise, which started as a TV anime in 2014.
The Seiji Kishi-directed series celebrated its fifth anniversary in 2019, and the fifth part of the five-part celebration is here to commemorate the third anniversary of the mobile game with a new short anime.
The free-to-play iOS and Android game—Yuki Yuna is a Hero: A Sparkling Bouquet—hit smartphones in Japan in 2017.