Hmmm... passed out girl with her ass in the air exposing her panties. Yup must be an AIKa anime. I finished the third installment of the on going AIKa story and sure enough it just can't be AIKa without the overdose of the fanservice in the way of girls getting constantly knocked out and exposing their panties in one way or another. AIKa: Zero takes place 3 years after R-16 and 7 years before Agent which I haven't had a chance to finish since Netflix doesn't have the second disk anymore.
In any case the third but second in the time line story finds Aika and group from R-16 investigating the disappearance of several cute high school girls. It looks like the problem comes from one particular club organization. Aika gets involved when she accidentally stumbles upon what is going on when she crash lands her little jet fighter and goes to look and see what caused her jet to crash.
Turns out it's an alien race that has taken over the bodies of the girls by doing a bit of surprise butt sex of all things. No really I'm not kidding the alien takes over the girl and to take over another girl golden like energy tentacles come out of the girl to hoist her up spread her legs and another tentacle jabs her in the butt. Half the girls are strung up to be poked and prodded later while the other half run around battling Aika and gang.
So yeah lots of nudity, lots of pantie flashing, some good fighting and I always laugh at them using "knock out" bullets but some good gun fights as well. Aika and gang of course kick much ass saving all the girls from some deep space examination I'm sure. Save for the two ring leaders who are taken captive by another girl. It was fun and will more than likely be picked up by someone for release in the States.
Here is an AWESOME trailer for AIKA: ZERO what even has some stuff from the other to series as well.
