This is the cover for the comic turned webnovel Leviathan.
As it's sharing the same home as other Project Moon stories, and Wonderlab is the intended main reason for this site, the "Begin" on the sidebar will take you to WonderLab instead - in order to start reading, you'll have to scroll down here and press the "Begin" at the bottom of this page.
If you're looking for a certain page in Leviathan, you'll have to press "L / Archive" on the sidebar instead. I've tried to keep it at least fairly straightforward.