In the Binfield Kingdom Chronicle, it is said that there was once a small, peaceful country called the Kingdom of Winfield, whose king and royal family possessed great white wings. Hamura Shou is newly enrolled at Yuusei Academy. After hearing about a student named Misonou Kai from the headmaster, Shou comes to believe that Kai is his younger twin brother, who he was separated from when he was younger. However, after a mysterious earthquake, Shou is suddenly carried into another world with two other students. It is in this new world that, after being attacked by a monster, Shou suddenly unleashes great, white wings.

Kazenone City, it is a city that made people feel nostalgic and wonder. It was also the home country of Okano Makoto and his little sister, Hinata. They came back this town in order to look for their mother who had disappeared suddenly. Their friends and childhood friends welcomed their return. Makoto began to notice something important through the encounter with them. With the tone of a harmonica, and with their thoughts in their hearts, the fantastic tale began in this mysterious town. (Source: AnimeNfo)

Arisa, a 16-year-old high school girl, accidentally has an extreme fighting suit that her brother invented implanted in her body. It's a slightly embarrassing suit that makes her emit an H voice when she transforms. Moreover, from that day on, Arisa is forced against her will to fight a secret society of evil. "Oh, I want to tell my feelings to Matsumoto-senpai, the man of my dreams, but only when I do so, I transform into an H battle suit." (Source: AllCinema, translated)

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)