Princess Army: Wedding★Combat

The story is about Aida Nonoka who is rescued from a drunken attacker by a judoist. She then resolves to become as good as her savior, hoping that one day to recognize him by the scar on his back. She then transferred into a new high school where she meets two older boys who could possibly the person to whom she owes her life and to give her heart.

(Source: AniDB)