Oinari-sama. Takes a Trip Again - S1.E20

Mystery! Kuu once again wins the lottery for a pair of tickets to an Onsen, however (due to various reasons) only Kuu and Noburu end up going. There Kuu gets a chance of solving a mystery about why various unplanned events end up happening. In the end, it turns out the culprits are only a few among the people present.