Even as a working adult, Sarasa Ichinokura suffers from an unshakable fatigue that's plagued her since childhood. She goes to bed one night, exhausted from her office job, and encounters a goddess(?) who informs her that her perpetual lack of energy is actually due to a deficit of 'mana.' Then, without any further explanation or time to process what's happening to her, Sarasa is thrust into a fantasy world!

She awakens in the body of a ten-year-old girl in a strange land filled with flying beasts and oversized wolves. She accordingly prepares for the worst, but a monster hunter named Nelly takes her in. The hitch is...now that Sarasa finally has the energy to do everything she wants to, being cooped up in a cabin is just no fun! She seeks to stand on her own in this scary new world-and that's going to mean learning magic.

It may be slow going, but Sarasa knows what to do-the best way to take her reincarnation is one step at a time!