Playing the Slacker in an Apocalypse Survival Game

The sunlight was still warm and gentle, yet it had become the culprit behind the world's plummeting population. It was as if the lush, flourishing plants had become the masters of everything. Human civilization was buried beneath the soil overnight, and evolution and resistance seemed to be the only way forward... Lan Chi: When on earth will all of this end? I'm so tired, everything's so hard. I just want to go back to my carefree days of doing nothing, sob sob sob. Everyone: No, you don't! (There is a CP, one-on-one romance. The plot takes center stage, and the romance is not the main focus. The heroine really is very powerful; she just hasn't realized it yet in the early chapters.)