Chapter four of The Centennial Case: A Shijima Story, The River of Oblivion, takes you back in time to the events that follow the first murder you solved with Yoshino and Josui. We learn a lot more about the Shijima family and the legendary Tokijiku fruit in this chapter.
After the Incident Phase, you'll once again be in the Reasoning Phase to solve another murder, so gather your clues, come up with some new hypotheses, and figure out who the murderer is.
Warning — there are spoilers throughout this guide!
Throughout the Incident Phase, there will be times when you are posed various questions. The answers you choose have no impact at all, so we have not listed them in this guide.
How To Solve Gen'ei's Murder
Remember, when pairing clues to mysteries that not all of your hypotheses will pan out and many will contradict each other, it's up to you to find out the truth of the matter.
You don't have to complete every mystery in this section. Once you have created enough hypotheses, the purple 'Reasoning' tile will appear and you can choose to complete this phase and move on to the next.
We've got each mystery listed below in the order in which they appear, and have detailed all the clues you need for each one and where to place them.
Anything Notable About Gen'ei's Room?
Position In Relation To Red Mystery Tile
Clue
Directly Above
Ashtray found by the riverbank
Top Right
Tanuki statues at the room's entrance
Bottom Right
Burned-out light bulb
Directly Below
The brazier was still burning this morning
Bottom Left
Kettle
Why Did The Killer Return To Gen'ei's Room?
Position In Relation To Red Mystery Tile
Clue
Directly Above
They were searching for something else?
Top Right
Realized evidence had been left behind
Why Was An Ashtray Found By The Riverbank?
Position In Relation To Red Mystery Tile
Clue
Directly Below
The killer dropped it during the escape?
Bottom Right
The killer got out through this window
Top Right
The flow of the river
How Did The Killer Escape from Gen'ei's Room?
Position In Relation To Red Mystery Tile
Clue
Directly Below
Gen'ei's room
Bottom Right
Open window
Top Right
Rope tied to the railing
Bottom Right Of Last Clue
Distance from the room to the riverbank
Where In The Room Did The Killer Hide?
Position In Relation To Red Mystery Tile
Clue
Directly Below
The small space in Gen'ei's room
Bottom Left
Low table
Top Right
Window
Directly Above
Closet
Why Did The Killer Prepare A Rope?
Position In Relation To Red Mystery Tile
Clue
Directly Below
Rope reaching the riverbank
Are There Any Clues That Suggest A Diversion?
Position In Relation To Red Mystery Tile
Clue
Directly Below
The commotion in the night
Bottom Left
Towako had been drinking until morning
Top Left
A wakeup call at seven o'clock every morning
Why Was A Rope Tied To The Kettle?
Position In Relation To Red Mystery Tile
Clue
Top Right
Heavy kettle
A Clue The Kettle Was Used To Pull The Rope?
Position In Relation To Red Mystery Tile
Clue
Bottom Right
Gen'ei's body
Directly Below
Ashtray
Bottom Left
A very heavy Shigaraki tanuki statue
Directly Below Last Clue
Tipped over table
Why Was The Rope Pulled With A Kettle?
Position In Relation To Red Mystery Tile
Clue
Directly Above
Kettle found by the riverbank
Top Right
I was searching for Ayame's glasses
Why Was The Killer Targeting Someone By The River?
Position In Relation To Red Mystery Tile
Clue
Bottom Right
Saeita Shijima
Directly Below Last Clue
Knocked my glasses out the window
The Sounds Heard In Front Of Gen'ei's Room?
Position In Relation To Red Mystery Tile
Clue
Top Right
A faint, distant sound
Bottom Right
Toppled Vase
Directly Below
Knocked-over armrest
Why Was The Vase Knocked Over?
Position In Relation To Red Mystery Tile
Clue
Directly Below
Swaying rope
Bottom Left
The winds from the mountain
Why Did The Killer Knock Over The Vase?
Position In Relation To Red Mystery Tile
Clue
Top Left
Gen'ei's room in a mess
Bottom Left
His kimono is in disarray, he tried to fight back
Bottom Right
A sound like something falling over
Who Could Have Entered Gen'ei's Room?
Position In Relation To Red Mystery Tile
Clue
Directly Above
What everyone was doing this morning
Top Right
Persons present when the body was found
Bottom Right
The night manager's testimony
Directly Below
Eizan left the inn
Bottom Left Of Last Clue
An emergency patient
When Was Gen'ei Killed?
Position In Relation To Red Mystery Tile
Clue
Bottom Left
The body is already completely stiff
Once you complete the Reasoning Phase, you move on to the Solution Phase. This begins with the Summary where Josui asks you questions and you use your hypotheses to try and build an idea of what happened. You only need to complete one set of questions and then you can select 'Finish Reasoning' to move on to the next part.
How To Identify Gen'ei's Killer
It's time to explain what happened to everyone involved and, of course, accuse your chosen suspect. Don't forget, if you make a mistake, you can simply retry. However, you will lose some points off your score for any mistakes made.
We have the correct answers listed in order right here:
The rope was tied securely
The killer didn't know Saeita was at the river
Eizan Shijima
The killer wasn't in Gen'ei's room
The kettle was used as a weight to pull the room
We were meant to hear the vase fall over
The ashtray must have caught on the rope
Eizan Shijima
His name written in the guestbook
His fountain pen was out of ink
Bloodstains on the tatami mat
Any additional questions in this scene have no impact, so choose whichever you like.