💘 As a general rule, I think it'd better for you to beat this chapter first to avoid any spoilers.

💘 If you want more info on beating this chapter, or on how to get the Bad Endings, I recommend this guide by I am the senate!
https://cs2bus.com/sharedfiles/filedetails/?id=1945743782

💘 I also think it would easier to collect all other IDs in this chapter first, partly to avoid spoilers, but also to lesson your Darkening as each body you examine gives you +2% Darkening.
- I don't know if this will affect how hard it is to beat the chapter, but just in case, I have a
short walkthrough for how to get through this chapter without any Darkening (outside of story
mandated Darkening).

💘 The most simple thing you should know is that you need to go the Body Pool BEFORE the Death Room after Sachiko joins you , but below is the right order of events in case you're not sure at which point to go (since going to the Body Pool multiple times can and will happen in this chapter.)

💖 Hold down CTRL to skip through the mountain of dialogue this chapter starts with (unless this is your first run through - which, as I said, it might be better to do this after already having beaten the chapter, but you do you, man).

💖 Select "Consider Other Options" ,

💖 Click on Bottle on Ground, you'll have to scroll down a tad, then Take It.

💖 Go to 1F Stairwell.

💖 Go North two spaces.

💖 Go to Girls' Room.

💖 Pick up Piece of Wood on the floor; hold CTRL to skip through more text.

💖 Go to Death Room first.
- Interact with cabinet, then interact with the sink, then selectPull it out.

💖 Go to Body Pool next.

💖 Go back to the Girls' Room.

💖 Go to Death Room again.

💖 Return to the Body Pool.

💖 Now you can enter Search Mode! There will be 4 bodies on the ground in front of the pool, and I'm not sure if you can just click on any body in the pool to get the ID or if I lucked out and the one most far left is the one you need, since I can't check - lemme know if you know in the comments below!