wow they're really going all out on this one huh? already killed the demon lord, got thrown away by humanity, built (or rebuilt) a mansion in the middle of nowhere, got a harem of lewd maid girls, and high tier magitech researcher...and he's still just a kid...AND the thief who just robbed the nobles shows up on his doorstep
could you have possibly stuffed more already overused tropes in there? cause there sure wasn't any room for an actual story