Android Q01. He is asked to replace Haru (who died in a plane accident) and help Kurumi recover.
Because of his parent's debt, Haru's been sent to slavery. He met his friend Ryuu there. Such a harsh life resulted in him putting a high value in money.
It was later revealed that Kurumi was the one that died in the plane crash. In order to escape the pain, Hal convinced himself he was a robot. In an effort to save him, Q01 was assigned the task of saving him by turning into Kurumi, in hopes of one day Hal will be able to move on from her death.