"300 Years of Slime" by Azusa Aizawa

Azasa Ezawa (アズサ・アイザワ) is the protagonist of the light novel and anime 'Fighting Slime for 300 Years, Accidentally Leveled to Max', nicknamed 'The Witch of the Highlands'. Her real name is Aizawa Azusa. In her previous life, she was a Japanese corporate slave, died of overwork at age 27, and was later granted immortality by the goddess. She was reincarnated in another world as a 17-year-old girl, reversing her name to become Azasa. To fulfill her wish of "forever young and leisurely," she lived in seclusion on the border plateau, spending 300 years fighting slimes every day, unknowingly reaching max level. She appears calm and composed on the surface, but is actually warm-hearted and good at making sarcastic remarks. She dislikes overwork but quietly helps those in difficulty. Although she is powerful (able to easily defeat dragon clan and Demon Lord's army officers), her long-term seclusion and lack of common sense often lead to misunderstandings, leading her to be mistaken for an 'unfathomable witch.' Her daily life is full of cute contrasts: on one hand, she pursues leisure, while on the other, she gets caught up in all sorts of troubles; While complaining about "how troublesome," she gently protects others.