Does anyone know what this directly means in Japanese?

@Citrusflavour Other thing I found is that "Amatsuka" is a last name (with different characters for the tsuka part), as well as Amatsukami 天津神, and Amatsukaze. The use of "tsuka" as representing the verb "tsukau" (使う, to use) with different characters 使 is the word play, since 使 is also part of Tenshi (天使).

I guess that part where I'm stuck is on the meaning of "uto" by itself here. I'm not sure.
Either way I would read the whole thing as 天使うと = Amatsukauto. Just think of it as the character's name.

@DDonde Interesting! Other English users call her Tenshi but In reality I find it curious what her full name is.

@DDonde When I watch her streams she seems very calm and angelic