If you're looking for manga similar to To Love Ru, you might like these titles.
20 years ago, Weve Aliens arrived on Earth to search for marriage partners. Weve are perverted and love interbreeding. With their advanced technology, they have solved all the Earth's problems to do with the environment, food, and resources. Gen is a student at the prestigious Human-Weve school Shinryou Academy. Due to his late grandfather's words, he loathes Weve and believes that pure humans will eventually die out if something isn't done about Weves soon. However, Gen meets the Weve girl Mirika, who falls in love with him.
Ataru is one of the most desperate womanizers alive, and a man whose life is about to become complicated. When aliens invade, he discovers he has been chosen at random to be mankind’s defender, and must play a game of tag with the beautiful alien princess Lum to decide the fate of the planet! After chasing her with all of his crafty techniques, Ataru finally wins, but his victory also means he must marry the princess herself! Now, with strange alien visitors and a jealous wife to handle, Ataru still manages to keep an eye on his ultimate goal: having his own harem!
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.
Emily, a transfer student, arrives at Kenji's high school. Kenji falls in love at first sight with the new student, but Emily is in fact an alien from the planet Chiara, an agent with the role of investigating the Earth in the form of a human mimic. As their civilisation developed, they began to degenerate as a species and eventually lost even the instinct to mate, so they came to Earth to learn about love and sex in order to ensure the survival of their species.
This is an in-your-face romcom with a mix of nudity and naughtiness. Caring for people is deeply ingrained in our protagonist, whose father is a butler and mother is a maid. Before him appears a rich young lady who is helplessly unable to do simple, everyday tasks. This is the start of a restless life with a young lady who cannot even change her own clothes!
16-year-old super-studier Nagi Umino, second-year student at the Meguro River Academy high school, was switched at birth. On his way to a dinner to meet his birth parents, he accidentally meets the brash, outspoken, Erika Amano, who is determined to make Nagi her fake boyfriend as she never wants to actually marry. But once Nagi makes it to dinner, he finds his parents have decided to resolve the hospital switch by conveniently having him marry the daughter his birth parents raised...who turns out to be none other than Erika herself!
Youta "Dateless" Moteuchi doesn't have any luck with girls; he has a crush on Moemi Hayakawa, but his chances are less than zero percent. However, once Youta hears that she's interested in his best friend, he finally gives up on her. On his way back he rents an odd sex video tape from the video store Gokuraku. At home, he plays the tape in his broken VCR when suddenly a beautiful girl named Ai Amano pops out of the TV. She's a Video Girl existing only for him, whose purpose is to hook him up with Moemi. Though, because the VCR was broken, so is she: Ai can love him, too!
Yasuke, 15 years old, is about to build up the courage to confess his love to his childhood friend Akari, who’s fallen for him, too. There’s just one problem: Yasuke’s family lives in a Japanese shrine, and when he breaks the shrine’s sacred mirror, it triggers a curse, releasing the cute and well-endowed goddess of misfortune, Orihime, into the real world! Now Yasuke can’t ever be out of Orihime’s sight—if he gets too far away, he dies, and can only be brought back to life with a quick kiss from Orihime!
A young boy gets saved from drowning by a mermaid but according to mermaid law, if a human sees a mermaid's true form, both are to be executed. The only solution to the problem is for him to marry her and become part of the mermaid family.
Yuto follows Mikoto, a childhood friend and high school girl who is one year older, to enter the same high school. When she goes home with Mikoto for the first time in a year, it turns out that Mikoto only sees Yuto as her younger brother. Yuto is a little dizzy about the difficult road ahead, but an alien "onee-san" in a very erotic outfit appears in front of the two...!?