You accidentally repeated 'for' twice in page 16, first panel.
Waka's nonchalance at the idea of human ghosts reminds me of a comment from a previous chapter, that there's a food chain or 'chain of being' of sorts and human ghosts sit near the bottom and so they aren't really that threatening. This means our MCs Inubousaki and Asama have been dealing with high level threats compared to other horror series, haven't they? That's quite incredible.