Rito Yuuki never gets a break—hes always finding himself in lewd accidents with girls around him. Although his heart still yearns for Haruna, his childhood love, Rito cant help but question his feelings for Lala, the alien princess who appeared in front of him and declared she would marry him. But now, its not just Lala he has to deal with: her younger twin sisters, Momo and Nana, have also traveled to Earth, wanting to meet their older sisters fiancé, and just as luck would have it, they end up staying at Ritos home.

Meanwhile, amidst the bustle of his new family members, Yami, the human weapon girl, begins her pursuit for Rito. Its not an easy life for Rito as he deals with uncertain love, punishment for being a pervert, and a girl dead set on murdering him.

[Written by MAL Rewrite]