Yuusuke was just a normal high school boy until the lovely, haloed, and naked Noelle fell upon him one fateful day. From that point on, his life changed in ways he could never fathom, especially when Noelle's family, people from the demon world, arrived. Now, while his house and perception of reality are steadily being transformed, other forces are working to prevent Noelle from achieving her goal of becoming an angel for Yuusuke by using robots, catgirls and UFOs! Can Noelle become a real angel before she's used as a pawn in someone else's plans?
In the present, the Japanese government has been conducting experiments to genetically engineer a human: a girl named Rizel. The experiment was a success -- sort of. While healthy and cheerful, 12-year-old Rizel also ended up possessing the uncanny need for “love” to further her development, as well as tears which were in fact volitile explosives! When sadness can end up destroying a city block, what's a girl to do except... get married?! For Iwari Tomori, the young man chosen as the most appropriate partner for Rizel, life is about to change, for better or for worse!
Both Rizelmine and Tenshi ni Narumon tell the love story of a cute but out-of-this-world girl with a reluctant, protesting guy. But that's not the only thing that similar, as they both convey the same feelings of romance and happiness, something that brings out all the good in your soul. Also the characters and plots are alike and they both have a nice humor in them.
It was just a juvenile search for adventure that brought young mystic Nakahito face to face with the android mega-weapon, Kurumi. With just a kiss, she is activated and answers only to him. Now they embark on a comedic journey that will carry them across Japan to discover the secrets of the Steel Angels and how such technology has come to exist before the advent of television. In their travels they will encounter spies, army agents and rogue Steel Angels but the real discoveries lie in the heart of a young teen and the miracle he has awakened with a kiss.