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

A goddess's intervention allows Azusa to be reincarnated as an immortal witch in a different world. She longs for a slow, quiet life, determined to avoid the deadly overwork that killed her in her last life. To make a little extra for her daily expenses, she nonchalantly slays slimes as a regular routine—for 300 years. Before she realizes it… she has achieved MAX level, becoming the strongest being in the world!