Taku is an ordinary eighth grader who has suddenly found himself in the land of Slaffleaze, a world much different than his own. Here, intelligent animals live like humans, and are ruled by Zalbo, an evil tyrant set on dominating both Slaffleaze and its twin planet Capricorn, the Earth. With the help of Mona, a human/dragon hybrid who is the last of her kind, and a handful of companions, Taku must fight to protect the Earth from Zalbo's incoming invasion fleet before it's too late!
Upon trying to save a friend from bullies, Shibuya Yuuri finds his head in the unlikeliest of places -- the toilet. Like a flash, Yuuri is then inadvertently sucked in, transporting him somewhere else! In this unfamiliar world of flying skeletons and magic, he is informed by a group called the Mazoku that he is to be the next Maou -- ruler of the kingdom! With harrowing and embarassing situations ahead, can our hero swallow his pride and lead a war against the common people when he can't even tell the difference between a slap in the face and a marriage proposal?
In the midst of a brutal alien invasion, 19 year old Tetsuya is in for a surprise: a close encounter with the beautiful alien princess Kahm! And the bad news? She sets her sights on Tetsuya for a sudden engagement of galactic proportions. Now, with Kahm's angry father out to execute him (did I mention he is the emperor of the galaxy?), the duo and their gang must save their marriage so Tetsuya doesn't die a virgin!