A year after their spaceship crash-landed on Earth, the alien species known as 'DearS' have been accepted into the Japanese citizenry. They are adored by many fan groups and trusted by most humans - with the exception of Takeya Ikuhara. Kind-hearted but resistant to change and skeptical of the DearS' seemingly-friendly behavior, Takeya tries to have as little to do with them as possible. But after he saves a girl from an incoming truck, and she turns out to be a DearS, Takeya ends up being far more involved with them than he could have ever imagined.
Feared for his fighting prowess and his ‘Devil's Right Hand', Sawamura Seiji is one of the most well known delinquents in town. Though, behind his devil facade Seiji is merely a lonely seventeen-year-old boy who only wishes to have a steady girlfriend. Despite being rejected twenty times, Seiji gets his wish, but not in the way he thought or wanted; one morning he wakes up to find that his right hand has been replaced by a small girl! Seiji's new ‘right-hand girl' is Midori, who has loved Seiji from afar for three years; but unfortunately for her, Seiji wouldn't be caught dead dating his own hand and simply dismisses her attempts to profess her love. Now Seiji must struggle to maintain his fearsome reputation and keep Midori a secret, while she continues to hope that maybe one day her and Seiji can be a real couple.
Both manga follow similar plot. An odd girl appears in male lead's life, starts living with him causing trouble for him in the process. So he is annoyed, but as the series progresses his attitude changes and grows very attached to the girl. Both series feature comedy, romance, a little bit of drama (mostly DearS) and a little bit of harem (not all that much though). If you liked one you might want to check the other one as well.
Yuuto Amakawa has had a tough life. Seven years ago, both of his parents were tragically killed in a car accident, leaving him without a single living relative. His friend Rinko Kuzaki has taken care of him every since. Yuuto's sixteenth birthday has arrived, but instead of a birthday gift of a normal life he meets Himari, a catgirl samurai who swears to protect him. Within weeks Yuuto's life is thrown into chaos as his family's dark past comes to light. With demons appearing around him, Rinko and Himari fighting for his attention and a sinister plot beginning to surface, can Yuuto live the normal, safe life he wants so badly?
These two series are similar in more ways then I would have thought possible. Both are fanservice laden ecchi, both are romance based, both involve a master-servant relationship. While Ren and Himari themselves are very differant, I would definately say if you liked one, you'll like the other.
Both of those series feature a slave-like alien race which came to earth to find masters. In both series the alien race is mostly female and the contract between the alien and human is done through kissing. Sekirei has actually a better plot (and probably characters) than DearS, but it also has lots of ecchi. On the other hand there is a bit of drama going in in DearS. Despite their appearance, both manga have more to offer than just fanservice and so, if you liked one, you might try reading the other one too.
Rito was just an ordinary high school student, but that changed the day an alien princess named Lala appeared in his bath tub. Before he knows it, he's engaged to the most important woman in the universe and her jealous suitors are trying to kill him! When Lala decides to enroll at his school, Rito has to survive both attempts on his life and Lala's crazy inventions, and somehow find the time to confess to his real true love, Haruna.
These two series are so similar its eerie. Alien becomes bonded to boy, boy is annoyed by it and begins to fall in love. They also both have cut-off anime made from them, and a similar art style. If you finished one and want more of the same, read the other.