Cosplay Alien

Cosplay Alien is a Japanese hentai visual novel with a comical science fiction theme. The player takes on the role of Yūsaku Tenkawa, a student whose ordinary life is turned upside-down when a spaceship appears over his school and a beautiful alien woman named Larfa emerges, claiming that she has come to Earth to marry him. After following Yūsaku home, Larfa is inspired by his stash of hentai manga and uses her ability to instantly change what she's wearing to try on a variety of costumes in order to seduce him. Things get more complicated when Yūsaku's childhood friend, Shiori Hoshi, gets involved, as well as a space pirate named Aqulia and agents from a foreign nation.

The game features two story routes, one for Larfa and one for Shiori, though depending on the player's decisions, the protagonist may also have sex with other characters: Larfa's mother Laylia who wants to teach Yūsaku the art of sex to prepare him for marriage; Larfa's catgirl rival Mia who tempts Yūsaku at every opportunity; Larfa's childhood friend Vanilla who has sex with Yūsaku for educational purposes; and the formidable space pirate Aqulia who wants to see what the fuss about Yūsaku is all about. The game features voice acting for the female characters.