Next to Me

Everything goes to hell as soon as teen robot builder/loner Satoshi discovers his childhood friend Nova has become a cyborg by the hands of his au pair, the mysterious "Celesta". What secrets do the trio hold that can untangle their far-from-normal situation? (The first chapter is a set of vignettes, while the story adapted from them starts at chapter 2. Inspired by the Otto Knows song of the same name.)