Even if she's expected to recover, Lala is still stuck in a pint-sized body--and she resolves to do something about it. Unfortunately, her invention goes totally haywire, shrinking Rito and Haruna down to be even smaller than she is! So small, in fact, that they could easily be stepped on. What's worse, Haruna's parents are coming home to visit. Everyone's going to need to work overtime to keep this mad-science mishap a secret!

Lala's been living on Earth with Rito for a while now, but he's about to get a couple of brand-new extraterrestrial guests: Lala's beautiful twin sisters, Nana and Momo! The royal twins are troublemakers, but the trouble reaches a whole new level when outer space assassins come gunning for Rito under the fireworks of a town festival. Meanwhile, Haruna makes a big decision--is she ready to admit her love for Rito?!

Life isn't easy when you're a high school student who is kinda-sorta engaged to the princess of the entire galaxy. All Rito really wants is a simple life with Haruna, his one true crush, but the universe has other ideas. Jealous alien suitors keep on trying to ruin Rito's life-- and the worst cosmic enemy he's encountered yet is about to make her appearance!

Mea may be safe from the domination of Master Nemesis, but everyone in Sainan is still in big trouble. The overwhelming, perverse power of Darkness still holds Yami in thrall, and the beautiful living weapon is on a rampage! There's just one hope to return her to her former self: her connection to Yuuki Rito. Yet with love and death all mixed up in Yami's mind, will Rito survive long enough to make a difference?

'" Rito and friends face off against the wrath of a killer body-snatching sword from outer space--and that''s actually the easy part of his day! The really tricky part is a little more amorous. Rito''s been close to all kinds of gorgeous girls, and Momo''s even pushed him to start inducting them into his own personal harem, but there''s one thing he''s never done with any of them: kiss! Now that Lala''s heard about how common kissing is on Earth, is it time for Rito''s relationships to go to the next level? "'

In this sequel series to To Love Ru, Princess Lala's younger sister Momo begins her own marital machinations to ensnare poor Rito. But to make her plan a reality, he has to become king of their interstellar empire, which would allow him to marry as many women as he wants! As Rito's heart continues to waver between Lala and his first crush, Haruna, Momo finds herself unable to deny the feelings she has for the hapless earthling high schooler. Could a human alien harem be the solution to all their problems?

The terrible, perverted power of Darkness has completely taken hold of Yami, and there's only one thought in her twisted mind: kill Yuuki Rito! When Lala rushes to her love's defense, it's time for a no-holds-barred battle between princess and assassin. Meanwhile, Mea struggles against the domination of Master Nemesis--will she be able to regain her own body in time to stop the chaos?