where can get access to this manga?... Show?... What is it actually?

It's a manga, but this image is just a 'dream scene' of sorts and has no bearing on the actual story.

Which revolves around the girl on the front left and the guy in the right with the backpack exchanging drool.

Yeah.

Hecate-chan said:
...but this image is just a 'dream scene' of sorts and has no bearing on the actual story...

I've read most of this manga, and yes, this image does have NO bearing to the story whatsoever... unfortunately.

I do think the story would be more interesting if it had something to do with this image hahaha, but that's just me.