C-22 was issued as a pilot for SMD-24-OX "五月雨 (Samidare)" According to the data, she is a female humanoid made by M.R.S (Machine manufacture Research and development System), who worked on developing the SDM series. Furthermore, it is hard for people to notice that she is not human unless not only judged by her physical appearance. She has to protect the humanity by going on dangerous missions in SMD-24-OX, which include a testing against the biomechanical construct Sylphid, an encounter with Anareta, the defense system of long-ruined space outpost Tetra-Biblos, and an encounter with the SMD series prototype, SMD-00x...
