Reborn in the Interstellar Era

Reborn with a life space and memories, I must become an S-class superhuman before the age of twenty, or I'll die? Holy crap, looks like I have to show my power in this interstellar era! Hmm, handsome, you want to propose with force? Fine, close the door, all you friends and family, get ready! If you dare to flirt, be prepared to be ganged up on.