In the distant future, humans live together with AI and history had been forgotten.
Youta enjoyed his quiet life even though he was often manipulated by his genius programmer (but also extreme troublemaker) sister, Akira.
One day while accompanying Akira, he came upon a hidden room. With the help of some old friends, they managed to open the door. Inside they found a pretty android girl in a deep sleep. Her body and her heart was broken. Akira decided right there that she wanted to fix her and her words fired up everyone’s curiosity, just like when they were kids.
Thus begins their heart-warming days with the android girl Cinema.
Shouta's younger step-sister.
Akira's carefree nature and sheer lack of ambition—not even motivated enough to do any kind of housework—leads her to rely on Shouta for all sorts of things.
However, she's a prodigy when it comes to computers—a trait passed down to her from her mother—and makes a living from patenting her own software and managing her assests via an artificial intelligence named "Akko." She also purchases servers and other expensive equipment and then assembles them in her room. Occasionally she'll get scolded by her teachers for hacking into the academy's network.
Upon encountering Cinema, she asks to repair her and brings her home for analysis and maintenance.