Rito is having a hard time adjusting when Lala's sisters move in...a really hard time. Momo's attempted seductions leave Rito frazzled--and then there's still the pressure of his unannounced love for Haruna.

Another suitor blasts his way into the picture, this time quite literally, as he wears an armored rocket suit.  He decided to cut straight to the point and keeps trying to snatch Lala.  Lala is able to dodge his attacks, but she finally get frustrated and fights back.  Wounded and with his armor damaged, he wander about, seeking advice from everyone, even Ren.  He comes up with a new plan to claim Lala and attempts to drug her.  

One of the school prefects, Yui Kotegawa, is all about rules, discipline, and good morality.  She feels that things have gotten quite out of hand and will not tolerate anymore lewd behavior.  Yui convinces the principal to allow her to set some rules for moral behavior at school and creates an enforcement squad.  Rito comes under Yui’s special attention, as she suspects that he is the one behind the corruption of good and decent values.  As punishment, Rito is banned from speaking to any girl for two weeks!  With Lala and Ren causing all kinds of havoc, it seems almost impossible that Rito will be able to stay in line.

A new rival has arrived at Sainan Private High School, Ren, one of Lala's childhood friends.  Apparently, Ren has held Lala in such high regard that he allowed himself to be her guinea pig for experiments, was proud of the memories where she made him cry, and is not the least be upset that she doesn't immediately remember him.  What is upsetting is that she still does not think of him as manly.  When they were young, Lala said that she would marry him if he became manly, but he still has a ways to go.  Not to be easily discouraged, Ren first turns to Rito for advice, then to the female students at school.  To prove his masculine strength and charm, Ren embarks upon a rigorous training regime, including fighting a gang leader and Big Foot before finally taking on a 120 km marathon.  Ren is so close to becoming the model of what all me should be like when- ... erm, gesundheit???

Lala seems to be really pushing Rito's buttons at school.  All she wants to do is learn a bit more about him, but she may have gotten the wrong idea in science class when they were doing frog dissections.  Little does Rito know that he's also being studied by another alien; this one a rival for Lala's affection.  To get Rito to back off, this supposed assassin has taken Haruna hostage! Will this new guy finally get a clue that Lala is not interested in him? Can Rito save Haruna and himself from this intimidating alien assassin?

Saki Tenhouin is the queen of Sainan High School.  She's the richest, the most popular, the prettiest, the vainest... you get the picture.  She's also the most jealous of Lala when she finds out that her popularity is on the rise amongst the other students (due in part to her sex appeal).  But Miss Saki will not be out done! She challenges Lala to the Miss Sainan Competition.  However, it's not a good idea to send an alien princess a challenge with an arrow stuck through it.  It's an even worse idea to try to kidnap her fiancé to ensure that she shows up.  Refusing to be made a fool of, Saki will learn Lala's secret and try to destroy her in the queen's challenge.  If she can get out of the escape pod that is...

Mikan is helping Lala feel right at home with delicious home cooked meals.  Her uncle Zastin, on the other hand, is not giving Rito a favorable idea of his future as the King of Deviluke, what with the waging of intergalactic wars and all.  Rito is desperate to find a way to get out of marrying Lala without attracting her father's rage and being at fault for the destruction of the earth.  Inspired by Mikan's hot meals, Lala tries to cook for the family, but as it's her first time, the results are sub par.  Rito sees his chance and declares that he will not marry Lala unless she can cook well for him.  Oh course he's wrong to think he just off scot-free, especially when Lala returns from a cross galactic grocery shopping trip, bound and determined don a love apron from outer space.

Lala and all of this marriage stuff are driving Rito insane! At least he can catch a few hours of sanity alone at school.  What?!?! Lala is the new transfer student?! Even though Rito implores her to keep a low profile, her antics are making her rather popular.  Even worse, Haruna has just said that she thinks Rito and Lala make a good couple! In an attempt to cheer up Rito and teach Lala more about earth culture, Mikan decides they should go on a tour of the city.  Disaster is narrowly averted following a literal wardrobe malfunction and Lala's inventions at the aquarium.  Oh, and Haruna ends up joining them on their outing which could be the beginning of a love triangle.

Yuki wakes up to Haruna and Lala yelling at him that he is about to miss the ship. Lala decides she can't marry unless he wants too.

Rito receives a message from the King of Deviluke which orders him to board the Devilukian spaceship as he has to prove he is the best in the universe. Before boarding the ship he confesses his feelings for Haruna.

Lala's personality changes due to a fever. Rito now has to deal with Lala's constantly changing personalitues and her desire to take over the world as a deviluke princess.

Saruyama wishes that he was a nobleman from the Edo Castle. He then starts to daydream about being the ruler of Edo Castle.

Everyone is upset by Yui's submission of what they should do for the culture festival. She submitted that they do a region research display or a calligraphy display.

Yuuki hears about an alien hotel being run by Mikade-sensei and Kimio. There Yuuki decides to try it check it out via the old school building.

General Mojack decides to try and take over the world so Kirisaki takes it upon her self to destroy him by turning into Magical Kyoko Flame.

Things go from bad to worse for Rito.  First, he has a bunch of aliens show up, and then he finds that he's engage to a galactic princess, now the girl he really likes is mad at him? How could things possibly get any worse? Oh, well, having Lala's father blow up the earth would be pretty bad. Rito has only three days to set things right and prevent King Deviluke's wrath over a broken engagement?

After seeing a commercial on TV promoting a hot springs, Lala tells Rito that she wants to own a hot springs. Lala then proceeds to build her own hot springs right in her own backyard.

A space ship flies over the school and drops off a package for Lala on the roof. Inside the package is a pregnant wolf that jumps out and tries to kill Lala.

Rito and everyone decide to go to the old school building to find out if the rumor of a ghost haunting the building is true.

Everyone decides to have a fun afternoon together at the water park.  However, Rito now has a new source of relationship drama: Run has fallen in love with him, too.  Through their whole afternoon, she tries everything she can imagine to get Rito’s attention.  From fishing poles to vacuums and even fabric-eating fish, each of her attempts ends in disaster for Rito.  She finally gets some advice from Montemitsu and Rito’s teacher, but finds herself in a spot of trouble with the other patrons of the park.  Rito steps in to help her and Lala whips out one of her new inventions.  Unfortunately for Rito, this is only the beginning of Run’s campaign for his affection.