Chained Soldier, Vol. 1 (manga)

Otherworldly spaces known as "demon cities" appeared in various parts ofJapan, andthose who partook in the "peaches" growing theregained unique abilities-but only ifthey're girls. One day, adown-in-the-dumps high school boy named Yuuki Wagurasuddenly gets lost atthe entrance of a demon city. There, he meets Kyoka Uzen, thebeautifulleader of the seven programs of "Magical Defense Corps," whoo ordershim tobecome her slave?!