Well, this was weird. I suspect it's going to carry on being weird. You know how ecchi anime tends to have overly sexualised teens? This has that. This has that so much, it's uncomfortable. These teens are desperate. Especially the main character, Jun'ichi.
It is impressively pervy, but also very self-aware. The anime comes with its own censor bars (crunchyroll addon, not in the original), which naturally draw attention to the things they're censoring. And porn dialogue. And crotch shots. It's ridiculous. And full of lampshades.
Can't decide whether it's going to be sneakily a harem show, given the range of characters in here. We've got childhood friend, who is tiny, except for her boobs. Perfect girl, who should be the unobtainable hero of a different show. And finally the "gal" of the title, defined primarily by a choice of fashion, that is stereotyped as "easy". Trust me, this is all sorts of uncomfortable.
But it is surprisingly funny. It's probably worth having a look at, as you'll decide pretty quickly whether it's for you or not. I'm hoping there's more depth in this than first appears, as well. We've had hints of vulnerability in Yukana (the "gal"), so I'm hoping this'll continue.
Recommended.