Momo is the younger sister of Lala, the alien princess who has long since n been engaged to the human Rito. Although Rito's heart continues to waver n between Lala and his first crush, Haruna, Momo finds herself unable to deny the n feelings she has for the hapless human male. Instead of giving up, Momo n attempts to surround Rito with a harem of beautiful women, all working towards n urging him to marry Lala, become crowned as King, and as a result, be allowed to n marry his entire harem-Momo included! n