thank for the translation the hardwork is truly appreciated. I can't wait to see Kokoro in her costume and lol poor Riku her expectations for these urban legends/mysteries have been subverted. I think all of the similarly themed festival presentations will end up empowered and boosting the final mystery... so it should last 4-5 pages when it actually makes it's move.
For every series dealing with the 7 mysteries of the school. Just do the same thing Reina did in this chapter if you ever come across the Stairs with the 13th step. You might be lucky and it might actually work 🤣