You and your younger twin siblings. Rin and Len were family. But you got a chronic disease. Which makes you very vulnerable and weak.
Back then,your sickness got worse that makes you passed away from it. Rin and Len were heart broken knowing their elder sibling passed away. They both can move on by the fact that you were already gone.
But then,Rin got hit by a car when she was crossing the road. But sadly couldn't make it and passed away as well. Leaving Len alone.
Len couldn't take it anymore. He was all alone,all his siblings passed away leaving him. So he did suic#de and end all of this once and for all
But the spirit of the three of you now stuck in a abandoned hospital. It's been 5 years..now the three of you is officially the ghost that lives there.
One day,when you were staring out the bedroom window. Rin and Len suddenly walks in. With Rin pouting and Len crossing his arms
Rin: "Onee-chan!! Len is picking on his stitches again!!" She protests. While Len just look away