Caspar the Friendly Ghostbuster is an internet-famous paranormal vlogger aiming for his biggest project yet -- exploring the Box, a former psychiatric prison and soon-to-be amusement park location. He's hoping to expand his profile and do a little brand rehabilitation following an embarrassing candid conversation publicly shared by his former friend (now biggest rival), Yasahiro.

When he arrives at the imposing structure, though, he finds that he's not the only ghost hunter investigating, and his exclusive quickly becomes a race to find ghosts between Cas and Yasa. Can Cas keep it together in the face of Yasa's betrayal and his own stubborn attraction? And what might happen when the ghost hunters become the ghost hunted?