I've Been Killing Slimes For 300 Years And Maxed Out My Level S2 Ep 9 - Female AP

Season 2 Episode 9 We Met the Evil Spirit Queen
Sometime later, Azusa receives a delivery, which is a special fertilizer that Sandra takes a liking to. Upon testing the fertilizer on Sandra, it causes her to grow into an adult as well as developing a change in her personality. She heads into town with Azusa, Flatorte, and Halkara to pick out new clothes. Sandra also falls in love with a tree and gifts Azusa with a bouquet of flowers, who hugs her in response. The next day, Sandra returns to normal, but she decides to use the fertilizer again on special occasions.