Da Capo II

Da Capo II takes place 53 years after the events of Da Capo, when Sakura Yoshino, weary of being alone for so long, wished upon a prototype artificial wish-granting magical cherry tree for a son—Yoshiyuki Sakurai. In the first arc, while Yoshiyuki attends Kazami Academy, beneath the school, he awakens Minatsu Amakase, a robot. Yoshiyuki helps her adapt to a life with humans despite robots being nothing more than mere tools. (wikipedia.org)