This was a fun experience!
I lost a couple of runs at the Shiori challenge due to not remembering the key words XD, however I managed to get the true ending on my third try.
I also lost the last challenge question once because I added "the" before the answer. It would be great if the game was a little more flexible in that aspect and instead of an exact match, it checked if the keyword was somewhere in the answer text.
Another small improvement suggestion: add a button at the end that gets the player back to the start after reaching the ending. Refreshing the page also works but you know, a button would keep things neat.
Good game! :D