
When I came to, I found myself in an unfamiliar room. I was taking advantage of my summer break to go on a ten day vacation with my best friend. We were enjoying the sights of Okinawa on the bus from the airport when— And that's the last thing I remember. Is this the hotel? Did I fall asleep on the bus...? The door wouldn't open and what we thought were windows were actually just screens displaying images of the outside. When we searched the room for some clue as to where we were, we found yet another screen displaying a single, mercilessly cold sentence: "You have been selected to participate in a behavioral analysis experiment." We have to choose and complete a task presented on the screen as instructed if we ever want to see the light of day again. If we play our cards right, we can get out in ten days—ten choices. Our options are extremely limited— Either my best friend has to physically harm me, or I have to debase my best friend sexually. At the mercy of these inhumanly cruel choices, the two of us decide to—
Room No.9 is a Japanese visual novel of 201,299 characters, with 7,970 unique words and 1,670 different kanji. Its difficulty rating on Jiten is average, 2.3 out of 5. The full vocabulary list ranks all 7,970 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.