Yuuna and the Haunted Hot Springs (2018)

S01E07 Yuuna's Mysterious Disapppearance

While Yuuna and Koyuzu are out on an errand, they encounter a stranger who unexpectedly calls out to them. Introducing himself as Genshiro Ryuuga, known as the Black Dragon God, he reveals that he has arrived in Yukemuri Town in search of a bride.