The action takes place in the future. The protagonist of the story is Ikaru Sudo, who specializes in "healing" robots and humanoids. Ikaru is a highly sought-after expert, with a constant stream of clients. The thing is, such services, which were once considered rare, have become highly demanded and popular in the not-so-distant future, when robots with artificial intelligence make up about 10 percent of the Earth's population. Sometimes they need assistance, and Ikaru is unmatched in this field...