"Yuri picked up the Ring of Shadows."

Notes:

On the playthrough after Sayory's suicide, when you pick up other girl that isn't Monika, this pair of disemboweled eyes will appear on the screen (I presumed it was Yuri's eyes, but who knows?). It reminded me the first time I picked up the Ring of Shadows in Quake (and for extra creepy factor, try playing DDLC with NIN on the background, especially Parallel Dimensions).