The Seven Mortal Sins (which is the conflict avoiding name of Hobby Japan’s Seven Deadly Sins franchise) is rated TV-MA for a reason… the cast is entirely made up of well endowed women who’s most frequent activity is losing their clothing one way or another. It’s all in good fun though as the anime knows exactly what it is and what it’s doing, occasionally poking fun at itself and larger entertainment tropes.
A wonderful example of this comes in episode 6 (Sloth Online) where Maria loses her armor, only to have it replaced with the skimpiest of outfits and when she complains, Belphegor (Sloth) tells her that the skimpier the armor the more effective. Not just funny commentary in general, but for those who remember it’s predecessor Queen’s Blade it’s almost like a little Easter egg.
Anyway… if you’re looking for this sort of thing… and you know who you are… this is an excellent example. There’s a plot, there’s plenty of action, there’s plenty of “sexy time” as Azazel of High School DxD would say… and you don’t get too many choices in this genre. I mention DxD because although this is super-fan-service-heavy, I wouldn’t want you to confuse it with the place we see most fan service these days: the harem. Both shows are fan-service shows, but Seven Mortal Sins is not a comedy and definitely NOT a Harem (although it has a Yuri aspect that may develop into a harem in future installments, that’s certainly not the focus). There are always plenty of Harem anime around… usually several a season, but this sort of action fan service show is actually pretty unusual. That’s why if you’re interested you should give this a look.
If you end up enjoying it (and it’s really a lot of fun as long as you’re looking for the fan service aspect) you should definitely check out the Queens Blade series that preceded it several years before. That has a lot more entries, unfortunately a little less focused in some areas, and unfortunately un-concluded, but still definitely worth your time if you enjoy this one.