Slime Tensei.: Daikenja ga Youjo Elf ni Dakishimeraretemasu

The Great Sage Marlin Endlight, on the moment of his death, reincarnated into a "Slime that can evolve endlessly" and became his daughter's familiar. And then, he left on a journey with his daughters to take back his mansion. The everyday story of Slime unfolds!

(Source: Square Enix, translated)