Elhanburg no Tenshi

From Yen Press: High King Madeth and his dear friend, the knight Lalvan… By all appearances, the ties that bind the two men are made of the sternest stuff, but in truth their friendship has always struck a most delicate balance. With the arrival of Lady Prima and then her newborn son, Perseus, the precarious harmony between Madeth and Lalvan crumbles. And years later, when the young Perseus, harboring questions about his birth, seeks out Lalvan, will the repercussions be much greater than a friendship lost? A lone angel, its eyes replete with sadness, watches the tragedy unfold…