Fantasy: I Am Really Saving the World

It's really not because my junior sister rejected me, I just want to save the world and save everyone's lives. If I don't knock you down now, how will I develop? I don't have good development, how do I level up? I can't level up, how can I add skills? Without skills and levels, you will all die. So, you guys, just be obedient and lie down, okay? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.