This manga is fuckin HILARIOUS and awful in all the RIGHT ways. It's basically a story where the MC has a time limit to do SOMETHING that causes a "Stage Clear", dark clouds pop up, fireworks pop up with "STAGE CLEAR" in the skies.
He abuses his Time Stop controller, as would we, and does sexual stuff, as he is a teenage boy, with all sorts of women, be they general villages and shop owners, or the most powerful women in existence, while they are frozen in time. He finds whatever way he can to complete his objectives before his timer runs out. He does as many side objectives as he can, like we would in our own games, and again, just does whatever it takes to complete his objectives, saving people that he can, and avoid dying.
It's almost always hilarious, with few objectively serious plot points.