Arisa 1

A bizarre android girl falls from the sky and crashes into Shinichirou's café, prompting her to recognize him as her new master and register him as her new master. Even though helping with housework isn't Arisa's strong suit, she manages to blend in with his sister, Kotomi, at least until a new girl turns up hunting for Fire Bee and ruins everything. Fire Bee: Arisa is revealed to be the weapon Fire Bee Shinichirou's father was working on before he vanished after a series of sexual escapades. The military is now anxious to reclaim her at any cost.