A brief description of the manga Isekai Cheat Kaitakuki:
I lived the life of a simple idler who once died because of his laziness.
But when I woke up, I found that I had become a child. It seems like I was reborn in a world of magic as the son of a lord in a distant village. In this world, now my entourage: Kara is my mother, busty maid Ruina and attractive Amelia is my half-sister.
Now I have grown up and enjoy my wonderful life in a world previously unfamiliar to me, using my highest level magical abilities and knowledge from the modern world!