It's the third day of the school trip, and it looks like Nanami and her friends will finally get a chance to enjoy Okinawa. However, Mikage pops up with a shinshi assignment for Tomoe-deliver a gift to the local shrine maiden.

But the simple errand has complicated consequences as Tomoe is forced to face Nanami's mortality and the seeming impossibility of a yokai and a human living together happily ever after.