Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita 2nd Season

An office clerk who dies of overwork at the age of 27, she tells the goddess that she wishes to be “immortal, and live a leisurely life in a house on a plateau”, and is reincarnated as an immortal witch with the appearance of a seventeen-year old. She is fully enjoying her new slow-paced life, but after 300 years of hunting only slime monsters to make a living, she maxes out her level at 99 from the experience earned and obtains immense magical power.