I tried to enjoy a slow life by becoming immortal, but I ended up becoming the strongest in the world just by defeating slimes?! After reflecting on my overwork in my previous life, I became an immortal witch and lived leisurely for 300 years—only to find out that I had reached level 99, making me the strongest in the world. Could it be that the experience points from the slimes I casually defeated piled up too much? Rumors spread quickly, attracting adventurers filled with curiosity, dragons challenging me to duels, and even a monster daughter who calls me "Mom"! I never even went on an adventure, yet here I am, the strongest? Huh? Then what about my laid-back lifestyle? A unique slow life in another world, where I only defeat slimes and become the strongest, begins!