OH SHIT THEY ACTUALLY DID BROTHEL MUSUME.
This is even less ambiguous than Streetwalker Musume! (Summer Night Town, Memory Seishun, Resonant Blue) Come on, you got the girls behind a gate and writhing on the wall... Come on!
Otherwise, this is still mismatch capital. Everything is awesome on its own, and then everything comes together and...What the fuck is this? Besides Brothel Musume, of course.
...My favorite moment is Sayumi twirling her hair.