A Normal World That Only I Find Strange

What do you do when sleep-talking turns you into an exchange student in another world?

Don't panic. You might make a fortune, but I can never lose.

A powerful ability?

Then I'll make a damn fortune!

An abnormal world lurking beneath everyday life?

Heh, that's all within my control too!

Wait... Why is this world so absurd, yet everyone thinks it's perfectly normal?