Ubuno Hatsuna (うぶのハツナ, Ubuno Hatsuna) is a character in Maesetsu!: Opening Act.
Ubuno has black colored hair in a mushroom-shaped hairstyle and black eyes. She wears thick black-rimmed glasses, a black wristwatch, and a turquoise jacket. Underneath the jacket, she wears a daffodil shirt that has the #83 in red with a matching color line underneath. She also wears black pants and brown shoes.
Contrary to her partner Junki, she's more soft-spoken and introverted. Ubuno tends to not speak shrilly like her partner as well.