20 years ago, a world-wide event known as the "Takeover" erupted across Earth. Evil monsters of all shapes and sized walked out of dark corners and alleys, attacking anything that moved. The military repelled them, for a short time, but it didn't last. Humanity was forced to scatter like cockroaches as the shadow monsters threw them into the dark.
Now, humanity is barely standing. There are many survivors still, but certainly much less than the evil that roams at night. Most major cities have been destroyed or overrun by creatures, with smaller towns or camps being only marginally safer.
You control the well known decently popular perfectly unremarkable human being known as Thomas Lanesworth, who for some reason unknown to man has decided to log down details about all the creatures he comes across. Note, he is actively seeking out monsters, staring at them, and writing down details about them. Can't go wrong at all, right?