This room is the second in the game to be divided into two sections. Ki and Gil will enter through that door at the top-left of the left section, which contains four Orange Bats (which take ten hits to kill) and four Blue Eye Knights (which take eighty-two hits to kill and have blue visors to see out).
The key at the left of the left section opens the aforementioned door at top-left of the left section, and the key at the bottom-right of the left section opens the door at the top-right of the left section. The aforementioned door at top-left of the left section leads back to Junction (Room Pass: QCY), and the door at the top-right of the left section leads to the right section (Room Pass: still 9V9). This is second time a Room Pass has not changed.
If Ki and Gil went through the door at the top-right of the left section, they will re-enter through the door at the top-left of the right section, which also contains four Orange Bats and four Blue Eye Knights. It is also shaped in the reflection of that left section (as you can see in the image to the right).
The key at the bottom-left of the right section opens that aforementioned door at the top-left of the right section - and the key at the right of the right section opens the door at the top-right of the right section. That aforementioned door at the top-left of the right section leads back to the left section, and that door at top-right of the left section leads to Priest's Quarter (Room Pass: D39). You should remember the second of these Room Passes...
