Sagara Sousuke is a 16 year old sergeant, who serves in the most elite paramilitary counter-terrorist force - Mithril. He is very dedicated to his work and constantly risks his own life. The young sergeant has never met his parents or any of his relatives and is used to count on only to him. But the biggest challenge in his life still hasn’t come- it is the meeting with Chidori. This girl truly changes him entirely, because meeting her awakes two different kinds of feelings in him. The first is duty to his work and the second one is the most beautiful emotion, that someone can feel- love. The fight within him never stops and our hero is always on the edge of his possibilities.