Saudade

Rin’s dad is in prison so Rin faces to experience being a death witch alone — beginning by reaping someone’s life by the order of Euphemia in commemoration of the coming of age that turned Rin's life into living purgatory, quite literally.
Looking at herself through a fractured lens, living through days but not feeling them.
A ghost cat asks for help to be sent to the world of the dead, with a promised reward from lord Euphemia. There is a star awaiting heroes, which its power grants what the person longs for most.