Outrageous! How Could I Be a Weakling?

What happens when an ordinary person is injected with blue liquid? Some people become monsters; Some people have become aliens; Some people have become invincible superpowers; And some people died directly. What should I do if my girlfriend is raped? Chop them up. Let's see how a weakling can counterattack and become a big boss! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.