Gave it a 9, as I felt it was a little inferior to the previous episodes.
Animation quality didn't retain the same impact, but maybe it's just that I'm getting used to the high standard of the 2 first episodes.
I liked the introduction of the art club members (especially Akiba), despite an initial weird feeling coming from the 2 girls.
Nagi's infiltration in the school grounds, and the avoided hug were priceless.
The haunted old school compound part left me a little unphazed, but at the end Nagi's desperate run and her meeting her sister mingled with the ED theme was definitly beautiful.