Dears Vol 1

Dears by Peach-Pit. A Romance comedy manga rated Teen, published in English by Tokyopop.

When a spaceship full of humanlike aliens called Dears crash-lands in Japan, the visitors are welcomed to live among humans. Takeya ends up with Ren, a "defective" Dear who is completely devoted to him. A fan-service-filled sci-fi romantic comedy from the creators of Rozen Maiden.