I've Been Killing Slimes For 300 Years and Maxed Out My Level

Azusa was a young corporate worker before working herself to death. When she wakes up and finds herself in front of a goddess who tells her that she is going to be sent to another world Azusa asks to be ageless and immortal. Azusa uses this opportunity to live a slow life where she doesn't need to work any more than she has to. Until 300 years later when word spreads that she had become the strongest witch in the world. 

This anime is a cute one and teaches the lesson that not everyone needs to be related by blood in order to be family. However, there is the occasional joke about a woman's chest size. This is an anime with hot springs episodes so you do see the top half of the girls without clothes on, there is also a scene where one of the girls takes off saying that they feel restrained wearing clothes because they don't have to wear any while in their dragon form and then proceeds to take her clothes off. There is quite a bit of swearing at the beginning of the series but the language gets cleaner in the last half of the series.