Tensei Shoujo wa Mazu Ippo kara Hajimetai: Mamono ga Iru Toka Kiitenai!  

Taking My Reincarnation One Step at a Time: No One Told Me There Would Be Monsters!, 転生少女はまず一歩からはじめたい～魔物がいるとか聞いてない！～

As an adult, Sarasa Ichinokura has always experienced chronic fatigue that has persisted since childhood. On one particularly tiring night at work, she is visited by a deity who reveals that her exhaustion is actually caused by a shortage of "mana." Without further explanation or time for processing, Sarasa is suddenly transported to another realm! She wakes up in the body of a ten-year-old girl in a fantastical land filled with flying creatures and enormous wolves. Despite her initial apprehension, she is taken in by a monster hunter named Nelly. However, now that she has the energy to do anything she desires, being confined in a cabin becomes unbearable. Determined to make the most of her new life, Sarasa decides to learn magic in order to become more self-reliant in this unfamiliar world. Although it may be slow going, she knows that taking one step at a time is the key to embracing her reincarnation.