Reincarnated as a Mob in an Otome Game. I Will Protect My Villainous Sister!

I thought the otherworldly reincarnation was supposed to come with a cheat and good-looking appearance?! In the game, this was a mob whose name I never even knew at all. He is Clive, stepbrother of the villainess. But this is a fantasy world with magic! There are dungeons, as I later learn! I was thrilled and excited, and I even had my attributes tested, but I didn’t expect to be unable to use magic! Determined to enjoy this world and help his stepsister avoid becoming villains, Clive decides to favour his stepsister anyway, so that she doesn’t become a twisted character. It doesn’t matter if it’s a Otome game or not, he’s going for a happy ending! Clive is determined to achieve a happy ending, but…