Imouto de Ikou – Episode 1

When a violent coup dumps Princess Mayuka's family from power in their homeland, she gets sent to Earth for some R&R and recharge her super powerful weapon. In order to get this Ultimate Weapon all juiced up again, the princess has got to study how humans go at it during sexy time - what turns them on, how they touch each other, that kind of thing.

She chooses a hottie college student named Yoshizumi as one of her research subjects and even lets him live in close proximity by crashing his roof with her ship. Oops! She gets captured by this dude and he even has the nerve to point a gun at her before brainwashing her into thinking she's actually his little sister, which is kind of cute if you think about it.

Luckily for both our heroines (Mayuka AND Earth), Yoshizumi grows real fond of this galactic babe and decides to help her out on her quest: getting the sexy, red-headed, green-eyed Akiho all fired up and ready for action using some old school 'stimulation'. This ain't no high-tech stuff either - just good ol' fashioned dirty moves.