i think nii-chan all ready left the apartment without yui at the end without leaving anything that yui can use to follow him. maybe he wants to finally set yui free.
Yui will just restart the cycle though (/TДT)/
I was predicting he hanged himself inside the room with his eyes wide open staring into your soul
the ending could be anything but i don't think it will the a 'happy' ending or those two ending up together.
sorry for the grammatical error
i think nii-chan all ready left the apartment without yui at the end without leaving anything that yui can use to follow him. maybe he wants to finally set yui free.