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