The Friend's Diary is a book item.
It is used primarily to inspect and learn what sigil will contain the Scissor Woman to her true form. It is only accessible in the Spine-Chilling Story of School Scissors event.
The text shown when used reads:
(page 14) Maru is acting strange. I need to talk with her after class. I hope she didn't attempt the ritual herself.
(page 15) I've hidden the candles in one of the classrooms. Tomorrow I will try to perform the ritual.
(page 17) A strange tall woman has been following me all day, I must hurry up.
(page 18) This sigil can weaken the demon for a while. Careful with the lines.
When on Timeline B, the Diary will also show the first 2 moves of the Ghosts banishment ritual in order (from top to bottom) at the top-left.
Acquisition[]
Found only in the player's storage in the Spine-Chilling Story of School Scissors event.