She looks like Ijika Seika to me.

That's not the "om nom nom' you should think of.

Yeah but what's link like love live? Is it a game, an anime, a manga? what's the main source?

It's an app where you watch streams for specifically Hasunosora.

Kore wa zombii desu ka? [Yuri ver.]

This reminds me of "Anemone heart" from the Umi/Kotori duo single,
I have no idea why.