Two years ago, Junichi Tachibana had a date on Christmas Eve but was stood up instead. Since then, he has had a hard time showing others his true feelings in fear of being rejected again. However, as luck would have it, Junichi may have a second chance at love when he meets several girls whom he becomes romantically interested in: Haruka Morishima, the energetic and popular upperclassman with a love for cute things; Kaoru Tanamachi, his childhood friend who harbors secret feelings for him; Sae Nakata, the timid transfer student who is shy around men; Ai Nanasaki, a girl on the swim team who has a bad first impression of Junichi; Rihoko Sakurai, a childhood friend with a love for sweets; and Tsukasa Ayatsuji, a seemingly perfect class representative who has a hidden dark side. As Christmas Eve approaches, Junichi can only hope that this will be the year he will finally spend the holidays with the one he truly loves.

In the year 2010, the Japanese radio industry is in decline. To reverse their flagging ratings, a station staffed with perennial losers makes a daring gamble: to hire the industry's first android on-air host. Maico is cute, but it will take more than novelty to win over the fickle audience -- especially with a crew as inept as this one.

Catian Eris is now on a mission to learn about Earth games and how they are played, but she seems to think that bets have to be placed every time. And while some bets are material items, eventually the Catians learn about betting items of clothing...

Kio is just another boring, nice guy with a boring, nice life until he meets a beautiful, curvaceous cat-girl while attending a memorial service for one of his ancestors. Next thing he knows, he's lying in bed with this half-naked beauty next to him! Her name is Eris, and she has come to Earth to learn more about its inhabitants as a representative of the planet Catian. And she's decided to set up shop at Kio's home for her stay on Earth! Unbeknownst to Kio, there are quite a few organizations who will attempt to capture Eris, looking to keep her existence a secret by any means necessary. What's worse is when people around Kio turn out to secretly be a part of those organizations! Kio will have to work hard to keep Eris safe from these shady groups. Things are about to get mysterious, exciting, and most importantly sexy in Asobi ni Iku yo!