Kotobuki Risu

The supposedly dead childhood friend of Kazuya. She was turned into an android by her father because she was dead and her father still wanted to see her smile. She lost all of her emotions in the process, leaving her but an empty vessel of a ‘living’ android. She may appear as the most precious thing to protect in this world, but under her cute and fragile-looking appearance, she is actually the strongest android in existence on earth.

[Taken from Kickstarter]