My Sister with Superpowers, I Put on a Skirt and Tutored Her

The good-for-nothing store manager is forced to open his business and returns to his old business. How will he continue to live in peace while becoming his sister's most unreliable but most powerful "senior"? Brother and sister join forces to fight against unknown monsters lurking in the shadows of the city. This may be the laziest and most heartwarming magical girl development story in history.