She's not Tachibana Momoka. Apparently, she's a virtual youtuber or a character from a game coming out in 2019. Her name is マジカルユミナ.
I don't know how to tag this. https://www.youtube.com/watch?v=YEuJFwwyU04

Doragonn said:

She's not Tachibana Momoka. Apparently, she's a virtual youtuber or a character from a game coming out in 2019. Her name is マジカルユミナ.
I don't know how to tag this. https://www.youtube.com/watch?v=YEuJFwwyU04

Now that you mention it, Momoka has blacker and shorter hair, my mistake.