Valerie Amaranth

Valerie is the main protagonist of the story. She is a cheerful and energetic sixteen year old girl who loves sweets, games, and eating. She's not very good at academics and is a bit naive, but she makes up for it in determination and optimism. She's been best friends with Ethan and Sophie since middle school, and trusts them more than anyone.

After having a nightmare she can't remember about a magical princess named Rosalia, Val unlocks the powers of the legendary Crystal Warriors and transforms into the warrior of love and hope, Diamond Heart. Now with her fairy partner Diana, she must rescue the missing princess and fight the evil Nightmare Agency, who plans on putting the world into eternal sleep.