If you spent day 2 on Uzuki’s route, then found yourself switching to Yumei’s in the second “Nie no Chi” automatic branch, take a left, here.
If you went through “Path of Illusion” and saw the inside of the Hazama Mansion, but didn’t see the scene, “Hashira to Kei” (where she discovers the scratches on the grandfather clock), OR if you ran away, instead of seeing the inside of the house, take a right.
If you saw the scene, “Hashira to Kei,” take the center route.