Guardian Hearts
Japanese title: がぁーでぃあんHearts
Type: OVA
Source: Manga
Episodes: 6
Status: Finished Airing
Aired: May 23, 2003 to Nov 28, 2003
Duration: 16 min per ep
Rating: R+ - Mild Nudity
Studios: Venet
Producers: KSS
Genres: Comedy, Romance, Ecchi
Themes: Harem, School

Maya, Kurusu, and Chelsea hit it off really well when trying to get revenge on Guardian Hearts for making them suffer. Maya and company thought that Guardian Hearts usually appears when Kazuya is getting along with a girl. Not knowing that Guardian Hearts is actually Hina, they leave her alone with Kazuya in an attempt to lure Guardian Hearts.

(Source: AniDB)