I've Been Killing Slimes for 300 Years and Maxed Out My Level (2021)

Reborn as an immortal witch after a life of overwork, I’ve spent 300 delightful years in peace, only to find myself unexpectedly at level 99 from slaying slimes for income. As tales of my power circulate, I suddenly attract a horde of eager adventurers, fierce dragons, and a monster girl who claims me as her mother. Though I’ve never experienced adventure, I’m now the world's mightiest witch. With my tranquil existence upended, I must navigate this new chaos and figure out what adventures lie ahead.