Seems to be character from a new light novel to be released December 2020: 脱法テイマーの成り上がり冒険譚 ~Sランク美少女冒険者が俺の獣魔になっテイマす (roughly, Tales of an Upstart Outlawed Tamer - An S-Ranked Adventurer Beauty Becomes My Beast Demon).
The character is ビレナ, which could be romanized many different ways, so I'm hesitant to make a tag at this moment (Vilena, Villayna, Birena?)