Hi Midnighting! I apologize for the late reply ;w;
So... at which point of the game are you on?
If it's the first day you need to talk to Sasha and Hilda, then go to bed.
If it's after the scene of the shadow and the paintings try this:
Go to the Third Floor (upstairs), get to the room on the left.
Check the barrels for a Tiny Key and the shelves for the Ground Floor Map. Check the map then, in the room on the right, check the chest for a Hammer. Then you'd be on your way to the endings!
I hope it helps! Let me know if you need anything :)
PS: Zakhari is in the party because you have an invitation for teatime, you just need to invite him using the ticket from the inventory :)
Sorry for the late reply!
Then it should be what I proposed above, I think I got where you are. Try this and let me know x3
Go to the Third Floor (upstairs), get to the room on the left.
Check the barrels for a Tiny Key and the shelves for the Ground Floor Map. Check the map then, in the room on the right, check the chest for a Hammer. Then you'd be on your way to the endings!