Rito is a high-school boy who just can't confess to the girl of his dreams, Haruna Sairenji. One day when coming home and sulking in the bath-tub a mysterious, beautiful, nude girl appears out of nowhere. Her name is Lala Satalin Deviluke, and she comes from planet Deviluke... there is no limit to the strange incidences he's goes through from here on out.
