Analysis:Yukidoh Plan Fail End

On the 7th day in Satoru's route, Satoru can enter the facility in Hotarubi Mine. But when he enters, he becomes trapped and meets with Yukidoh and Enomoto from this time era (July 2011). They say the plan failed and kill Satoru to "take care of him".

How did the plan fail? Why was it necessary to kill Satoru?

Note : The ending is called the "Yukidoh Plan Fail" end, and the scene is called "Apoptosis". Apoptosis is the process where a cell kills itself if it becomes defective. The defect in the plan -- "Satoru" -- was killed. Satoru disappears from the world as though he underwent apoptosis.

For the sake of the entire plan
In the final level of the Yukidoh Plan, the player's consciousness leaves the 7th day and returns to the 1st day.

Since the underground room already transfered, if they went outside they would now be in Hotarubi. What happens to the player's consciousness if it's allowed to freely wander around Hotarubi during the "final level"?

The player's consciousness from the final level may live out the six months and return to the first day with a body. With two copies of Blondie's body, there's no need for the player to enter the body on the clock tower. In that case, the player exits the infinite loop and the Yukidoh Plan fails. They had no choice but to kill him.

If they kill Satoru, naturally the player's consciousness leaves his body. The player would then think "Satoru died in a bad ending. Again."

Then they go back in time to avoid the bad ending.

They never escape the infinite loop.