A contracted mercenary with Sunlate, Mutou is tasked with protecting Dr. Felicia Epstein as she waits for a meeting with her uncle. When the two of them discover the android 1019 in the rubble of Felicia's uncle's home, Mutou abandons his contract to escort her safely to Oz. Along the way, he falls in love with her.
~!After discovering that Felicia's brother Leon has suffered a mental break, Mutou assists in a plan to blowing up Oz. He is mortally wounded in a fight with Leon, but found by 1019 who is able to cryogenically freeze him. Six years after the destruction of Oz, Felicia finds and revives Mutou.!~

Loosely based on L.F. Baum's novel, The Wizard of Oz. Original manga done by Itsuki Natsumi. 
A nuclear war has killed most of humanity and split the USA into six warring states. By 2021, a legend has grown up about the fabled city of OZ where everything still works. Scientist Felicia sets out in search of it with the mercenary Muto and android 1019. At the end of the quest they only discover a military base and a madman. 
A mercenary was hired by a girl to bring her to the mythical Oz (a paradise) where her missing brother supposedly lived. Accompanying them was a cyborg sent by her brother. But Oz was not the paradise it seemed and her brother was not as sane as he was smart. 
(Source: AniDB)

Mutou You