My Adorable Little Sister and I Can Each Slaughter Our Way Through Another World!

He transmigrated after agreeing to an otherworldly goddess's conditions, and the goddess even gave him an incredibly adorable, gentle little sister as a bonus. You ask if that's a good deal? An Feng says it's better than good, except for one little problem: why is he still a powerless good-for-nothing even after transmigrating?! Damn it!

Oh, he does have a cheat ability. It's just such a bizarre one that he doesn't really want to use it...

Looking at his little sister's flawless smile, An Feng falls into deep thought. Is he really going to live off his little sister?