Ubel Blatt

When Szaalanden was about to be invaded by Wischtech, the Emperor sent fourteen youths in order to stop the invasion. Three perished along the way, while another four was said to have betrayed the lord, and thus was killed and called the "Lances of Betrayal". So, only seven came back alive, and they became known as the "7 Heroes". Two decades later, a boy known as Koinzell has begun to hunt down and kill the Heroes. <em class=de-emphasized>(from manga)</em>

Synopsis from Anime News Network