Need help unlocking a scene in Cartagra

[roastedmushroom]

Need help unlocking a scene in Cartagra

 

Hi all, I apologise for making this thread and I hope it's in the right forum. ^^;; 

So I've reached the "true end" and unlocked all the CGs and have 1 scene locked(14/15). 

Does anyone know how to get this one? 

 

https://drive.google.com/open?id=0B8N0tx4-NJMMcDJjTlllbS1sQzg