[Crossover] You Know Nothing About Power

After a useless loser-taming System fell from the sky, Sawada Tsunayoshi's peaceful life was never the same again. "Being a loser isn't so bad..." "No, I don't want to play basketball!" "Leave me alone! I'm just a loser. I can't beat aliens armed with deadly weapons!" "...All right, I'll do it, okay? D-don't cry... ⊙﹏⊙" Then one day, after roaming through all kinds of worlds, the once-useless Sawada Tsunayoshi finally returned to his own world. He thought he could at last start living a peaceful life, but then... "Huh? The □□ boss?!" "You've got to be kidding! Who would want to do that?!" "A world that can only be saved by a fourteen-year-old might as well be destroyed!" "You're crying? It won't help, even if you cry!" "...I'll do it, okay? Stop crying. ⊙﹏⊙"