After you and Phi go through the Infirmary with Tenmyouji, you choose to ally with Tenmyouji.
During a plot sequence, you will be asked to choose which room to investigate. It doesn't matter which you choose. You will eventually have to go to all of them.
Eventually it is time to decide which door to go through. You won't be allowed to choose option C because Alice and Phi don't want that option.
Option A
- Sigma and Clover go through the blue door with Tenmyouji
- Luna and Phi go through the green door with Dio
- K and Alice go through the red door with Quark
Option B
- Sigma and Clover go through the red door with Dio
- Luna and Phi go through the blue door with Quark
- K and Alice go through the green door with Tenmyouji