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

スライム倒して300年、知らないうちにレベルMAXになってました

After working herself to death as an office employee, Azusa is reincarnated by a goddess as an ageless, undying witch and settles in the highlands for a quiet life. Her routine — hunting slimes in the nearby forest for magic stones to sell — quietly stacks experience until three centuries later she hits level 99 without noticing. Once word of the Witch of the Highlands spreads, challengers and would-be companions start showing up at her door.