Scarlet Fragment

Hiiro no Kakera (緋色の欠片) is a Japanese anime television series based on the visual novel of the same name. It will premiere in April 2012.

Story
Tamaki Kasuga has supposedly gone to live with her grandmother after her parents are transferred overseas. But the real reason for her arrival is that she must continue the role, handed down from her ancestor Princess Tamayori, to seal the sword Onikirimaru. Five young men serve as her guardians against the mysterious Logos.