Mugen No Minamo Ni

there is a rumor going around about a person called the “contract killer.” if you want someone killed, the contract killer will kill that person for free – if you know how to contact the contract killer. nashi is a girl that's immortal. she wants to die but is unable to. the only thing she loves in this world is a girl named minamo, who she lives with. minamo may look like a girl in her late teens, but she's really only 9 years old. not only that, minamo has a limited life span, and nashi doesn't want to lose her. so in order to extend minamo's life, she secretly kills people that someone else wants dead, for free. as a reward, she recieves “time” from the time merchant, which she then gives to minamo to extend her life.