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

Azusa Aizawa, a former corporate worker reincarnated as an immortal witch, has spent three centuries killing slimes near her highland cottage — only to discover she has hit level 99. Word of her power spreads, drawing the red dragon Laika, twin slime spirits Falfa and Shalsha who call her "mama," the scatterbrained elf apothecary Halkara, and the demon lord's aide Beelzebub to her doorstep. What was meant to be an uneventful second life turns into a growing household of monsters sharing meals and minor crises in the countryside.