Rito Yuki is a bumbling boy who wants nothing more than to confess his love to the lovely Haruna, but a variety of obstacles always seems to stand in his way. One day, while relaxing in his bathtub Rito found his hands full - literally - with the breasts of a strange alien girl named Lala who suddenly appeared in his lap! She is the princess of Planet Deviluke, and she has run away from home to escape the prospect of an arranged marriage; and unfortunately for Rito, his accidental groping is the traditional engagement ritual of his otherworldly guest! Deviluke's emperor will destroy Earth if Rito backs down from his "proposal," but all he really wants to do is be with Saruyama! Naked antics, magical powers, misunderstandings, Lala's marriage-happy family and Rito's own shyness are many of the barriers he must face in his attempt to win the real love of his life – that is, if Lala doesn't win him over first!
What if roller skates had high power engines that enabled the skaters to do stunning new tricks that defy gravity? What if you saw a beautiful girl effortlessly glide through the air with them? To Ikki, this is reason enough to secretly borrow a pair of Air Treck skates, and step into an underground world filled with gang fights and strange customs. Enamored with high-flying stunts and the flirtatious Simca, Ikki forms an Air Treck gang of his own and starts a life of fighting rival gangs and flying over the rooftops, chasing the girl always one kick ahead of him.
Life continues as ‘normal' for Birdy and Tsutomu. Though they still co-exist in the same body, Tsutomu is able to focus on his studies while Birdy keeps up with her celebrity job and Federation Investigator duties. However, things become more complicated when a transport ship housing prisoners connected to the Ryunka incident is hijacked. The aliens on board escape to Earth and blend in with the human population, and it's up to Birdy to capture them unharmed and escort them back to headquarters. Yet Birdy soon discovers that there are other forces involved, and it'll take everything she's got to bring these criminals back alive!
Having failed to earn admission to a university, Hideki Motosuwa has moved to the big city, determined to study his hardest for next year's exams. However, an unusual distraction presents itself one unsuspecting day in the form of Chii, a robotic young girl that has been discarded in the trash. In a world where an increasing number of people turn to these 'persocoms' for company, the bonds and limits of human relationships are tested as flesh manages to fall in love with the machine itself...
Ten years ago, Senpeita Kobayashi fell in love with the girl of his dreams; she left his life, but promised that in ten years she’d see him again and become his bride. Fast forward to the present, and Senpeita is a typical student attending Akebono Academy. That is, until the wide-eyed tiny robot Kemeko crash lands in his bedroom and proclaims herself to be Senpeita’s new bride! As if things aren’t strange enough, Senpeita soon discovers that inside Kemeko is a beautiful girl – a girl who has an uncanny resemblance to his lost love! All Senpeita wants is to be a normal boy, but now he must keep himself out of the way of flying fists, raging jealousies, and battles between Kemeko and Mishina – a global corporation that has a vested and dangerous interest in Senpeita!
The premise of these two shows is almost identical, as is the animation style. Both series are about a pink-haired alien girl appearing to a high school boy's life and causing all sorts of havoc with hilarious consequences, without forgetting the romance side of things with the addition of a human girl love interest for our male main character.