Sousuke Sagara is the protagonist of the series. He grew up in Helmajistan, a region in Afghanistan are caught up in political disputes.
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At age 8, he joined the guerrilla movement to survive, and eventually found their way to Mithril. Sousuke just know the military life, so he was suspicious of anything unusual. He also had a difficult time integrating into high school life, such as social skills were not quite up to par, earning the nickname 'Military Maniac'. Sousuke can be very sensitive at the time, for example, in volume 7 when she bought a pregnancy test came out with Kaname and do not understand what was wrong, although his intention was always in the right place. His deep feelings for Kaname Chidori inevitable clear at the beginning of TSR when he punches his fist through a laptop with a message direct orders to not contact him again.