Several murders of varying types (i.e. poisoning), but depictions aren't very gruesome.
References to suicide.
Relationship between an adult and a young teen with arguable romantic undertones (continued from 1bitHeart).
Mention of car crashes.
Use of alcohol.

Introduction

Talk to Nanase with the word bubble.
Select the magnifying glass to search the area.
Check all the points in the scene, then return.
Talk to Nanase again, and interrogations will begin.

Interrogation

At statement 4 ("since I fell backwards"), present Forehead.
Show Clock.
Show Memories of Clock.
Show Glass Ball.

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Chapter 1

Leave Misane's room and enter Nanase's (the middle door). Talk to Nanase.
Leave the room and talk to the girl in the hall.
Head right to the lobby and talk to the man.

Take the elevator to 2F: Gimmick Room.
Return to the lobby and take the elevator to 4F: Garden.
Return to the lobby, then left to the rooms, and a scene will trigger in the hall.
Head right to the lobby, and a scene will trigger.

Talk to the mechanic in front of the elevator.
Take the elevator to 2F: Gimmick Room.
Go to Nanase and select the magnifying glass.
Check all the points in the scene, then return.

Go down to the lobby and talk to Teruhi, Koza, and Merue.
After talking to Koza, also use the magnifying glass to show him the Little Door.
After getting info from everyone, interrogations will begin.

Interrogations

1. Teruhi
At statement 1 ("searchin' for something"), present Extension Cord.

2. Koza
At statement 3 ("hurried to look for Teruhi"), present Eerie Voice.
Show Fatcats.

3. Merue
At statement 4 ("why did you die in that room"), ask more, and point out the issue.
Show Shitsuna's Actions.

4. Teruhi 2
At statement 2 ("you're gonna put up some resistance"), present Sleeping Pills.
Show Shitsuna's Actions.
Show Cat Door.

5. Merue 2
At statement 4 ("I don't even have the power"), ask more, and say there was some means.
Show Gimmick Room.

6. Koza 2
At statement 4 ("is the method you propose not impossible in practice?"), present System Issue.
Lastly, present Victim.

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Chapter 2

Go to Nanase's room and talk to him.
Go to the lobby to talk with the woman.
Take the elevator to 3F: Footbath.
Talk to the man in the lobby.

Take the elevator to 4F: Garden and talk to Namoto.
Talk to Shinobu.
Go left to the rooms, and a scene will trigger in the hall.
Go to Nanase's room and talk to him.

Take the elevator to 3F: Footbath.
Talk to Arumu and select the magnifying glass.
Check all the points in the scene, then return.

Go to the lobby and talk to Ashley and Nomare.
Also, show Ashley the Wine.

Interrogations

1. Nomare
At statement 4 ("forced him to drink it"), present Crime Scene.

2. Ashley
At statement 4 ("poisoned his drink"), present Untouched Alcohol.

3. Namoto
At statement 3 ("private stuff"), ask more, and press further.

4. Ashley 2
At statement 4 ("drink that poison and wine"), present Cold Medicine.

5. Nomare 2
At statement 3 ("downed the poison and died"), present Order of Intake.

6. Namoto 2
At statement 3 ("got his front drenched"), present Wet Body.
Show Sataka's Tastes.
Show Wine.

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Chapter 3

Go to Nanase's room and talk to Arumu.
Go to the lobby and talk to Nanase.
Take the elevator to 4F: Garden and talk to Shinobu.
Go to the lobby and talk to Nanase.

Go to Nanase's room and talk to Nanase.
Check the right door in the hall.
Talk to Koza in the lobby.
Check the right door in the hall again.
Check all the points in the scene, then return.

Interrogation

Arumu
At statement 4 ("the hotel owner"), present Guest Entry Data.

Take the elevator to 4F: Garden and talk to Shinobu.

Interrogation

Shinobu
At statement 3 ("with a poison mist"), present Corpse's State.

Talk to Arumu in the hall.

Interrogation

Arumu
At statement 4 ("sorta the same way"), present Varying Causes.

Take the elevator to 4F: Garden and talk to Shinobu.

Interrogation

Shinobu
At statement 4 ("what are you thinking"), ask more, and say yes.

Go to Nanase's room.
Take the elevator to 4F: Garden and talk to Shinobu.
Choose Fatcats.