Kazuya is a normal guy who discovers the secret identity of a space alien named Hina, who comes from the Planet of Light. She is a member of the Guardian Hearts--well, to be exact, Hina is a Guardian Hearts dropout, and she is assigned to protect earth as a last chance at redemption. When Kazuya finds out Hina's secret identity, her mission may be over before it has a chance to begin. That is, unless a crazy little thing called love gets in the way!
Hina and Kazuya are constantly being attacked by the enemies of Gaarts--BURN, whose objective is to take over the world! In the midst of all this chaos, Hina recieves a very important mission: to guard Gaarts's special Shining Bird. Will Hina and Kazuya be able to complete the mission and protect the special Shining Bird with BURN at their heels? Perhaps with the help of Kazuya's newfound powers...
Kazuya is just getting settled into his new role as one of the Gaarts, but the evil organization BURN is out to conquer the world with...a sports festival? When BURN kidnaps Kazuya, it's up to Hina and the rest of the girls to save him; If they can stop getting in each others way first! And what's this about Kazuya's long-lost fiancee? The drama in this house is getting out of control!