ข้อมูลอนิเมะTo LOVE Ru

A mysterious extraterrestrial girl named Lala runs away to Earth in order to avoid daily arranged marriages set up by her father, the king of her home planet Deviluke. Due to one of her own inventions, she teleports naked into fifteen-year-old Rito Yūki's bathtub, and he accidentally feels up her breasts. It is later revealed to him that this is equivalent to a marriage proposal on Deviluke, and Lala happily accepts to become Rito's future bride. Rito, on the other hand, harbors feelings for a girl in his class named Haruna Sairenji, and does not want anything to do with Lala.

Rito discovers from Zastin, Lala's uncle and leader of her personal guard, that if he were to back out of his engagement with Lala, that he would be killed and Lala's father would destroy the Earth. Rito hypothetically asks him if it were somehow possible to back out of his engagement and not suffer the repercussions. Zastin tells him that he must feel up Lala's breasts once more within the first three days of his engagement in order to call it off. While he attempts many times to touch Lala's breasts, he does not make it in time, and thus is stuck with the engagement. The next day while at school, a new transfer student is announced to the class. Just as Rito is thinking that school is the only place that he can breathe anymore, Lala is brought into class and all of Rito's hopes of a quiet school life fall apart.

Rito is devastated to hear from Haruna that she thinks he and Lala are suited for each other. At home, his younger sister Mikan notices Rito's depressed look and suggests that they should go out the next day to show Lala around town. While out, Lala's artificial intelligence helper Peke loses most of his energy, and due to this, Lala's clothes start dissolving. They head into a store and buy her new clothes, and while there run into Haruna. Together with Haruna, they go to the aquarium together, but their time is cut short when Lala makes a large disturbance which sends torrents of water throughout the halls.

Rito gets scared when Zastin tells him that Rito will one day be the king of Deviluke due to his future marriage with Lala, and that he will have to participate in interstellar wars. That night, Lala cooks but the food is dreadful. In an effort to try and get out of one day participating in wars, Rito shouts that if he will not marry Lala if she cannot cook. Lala quickly leaves and goes back into space, but appears again the next day at school with the intention of cooking something good for Rito. She collected ingredients from all over the galaxy which are still alive and reek havoc in the school. Lala later explains to Rito that he does not have to go to war if he does not want to, and even her father did not join in on the battlefield lately. To further reassure him, Lala tells him that after they get married, she intends to live with him on Earth.

A pretty, rich girl named Saki Tenjōin comes back to school and finds out that other boys prefer Lala's beauty over her own. She gets really angry by this and tells her friends to give Lala a letter asking to challenge her in a beauty contest. To make sure she shows up, she kidnaps Rito as bait. Lala ends up telling Zastin about the letter, which he mistakes as an assassination attempt from Saki. Rito, still kidnapped by her, is warned by her that if Lala fails to show up in time, he will be forced to touch her breasts in front of the entire school.

A shape-shifting alien assassin comes to propose to Lala. However, he changes himself into the principal and takes Haruna hostage in the gym equipment room. There, he uses tentacles to feel her and lure Rito to the room. When he gets there, the alien tells him that he will give him Haruna if Rito cancels his engagement with Lala, but Rito does not go along with his plan. After Lala arrives, the alien shape-shifts again and becomes much large and intimidating, but Rito stands his ground and attacks the alien head-on which makes him reveal himself as a weakling who has many wives and families across the galaxy.

A childhood friend of Lala, Ren Elsie Jewelria, arrives on Earth claiming he is manly enough to marry Lala. He constantly attempts to impress Lala by showing off his strength, speed, and looks, but all his efforts are in vain. After failing many times, Ren asks Rito how he is able to be manly enough for Lala. Ren watches a movie (Rocky VII) about how to be a man, and he works out non-stop in order to get Lala to love him. Eventually, Ren completes runs a 120 kilometer marathon and goes to Lala to hear her finally tell him how manly he is. However, at this time, he sneezes, causing him to turn into Run, a girl. Apparently, whenever Ren sneezes, his body and mind change genders into the innocent Run, and vice versa, due to his species carrying this inherent ability.

A school student, Kotegawa Yui has had enough of the "ecchi" in the school, and tries to set the school some morals. Not only does she try to clean it up, but enforce some new school rules, and has a squad so to speak, to check on the students. Shortly later, Yui has started to realize that Rito is behind all the "ecchi" in school. So she gives him punishment so he wont be able to talk to any girls for 2 weeks (well after persuading the peverted principal of course). But Yui comes to see that Rito isn´t like that, and then removes his punishment. Yet things go badly wrong when Lala's machine pulls him to her.

A guy with a rocket suit comes for Lala. The Rocket Suit guy constantly tries to attack Lala to grab her back with him but fails to do so many times. Lala gets mad at him and tries to kill him. He breaks down his armour suit and walks around the streets at night for advice. He even askes Ren for advice. Mikado-sensei finds him and heals him and he attempts in kidnapping Lala by making her drowsy and paralyzed...