Sunlight lamp
Clears the (volumetric) fog, but gives away the position and pisses off the vampires majorly
Sake Bottle
Besides being able to throw the bottle to create a distraction, (Audio for every enemy, a dirt spot for Sakuya) the user can also drink the bottle and gain immunity for some time. But you're drunk for a short amount of time. That wobbles the screen and makes movement a bit wonky.
The F3 Key
Shows the current room's coordinate, 100% not a reference to Minecraft.
(Scrapped, because Useless)
The Compass
Shows a compass at the top of the screen, allowing the user to get a sense of direction.
Maidens Pocket Watch
When cleaning, the player can sneak up to Sakuya and steal her pocket watch. (That needs to stay a secret between you and me, okay?)
Using the Pocketwatch allows the player to slow down everything. Marisa can move at a normal pace though.