This surreal, experimental comedy manga by kashmir is about a girl named Misuzu, whose older sister, Naoko, returned from studying abroad, just to find out that she's been substituted (?) with Naoko-san, an alien from planet Yuri-sei (Lesbian planet), who loves eroticism, yuri and girls.

The series started being published in Monthly Comic Dengeki Daioh in 2005 and its second volume was published in 2008. Now ASCII Media Works' Monthly Comic Dengeki Daioh magazine announced that its anime adaptation is currently in the works.