Hints need to be translated, but even then, I had no idea how to understand the calendar clue
Fun!
Some puzzles challenging if you don't read Japanese. Was able to solve those puzzles through trial and error with different combinations. Completed without walkthrough.
Super easy.
Door in the wc room opens with signs on poster in the left cabin. You need to apply something to see them clearly. Triangle puzzle - 724!!! It would be easier if the game had english version.
Escaped in English! Wrote down japanese signs and google words. Took me a while to do but it is possible to escape! Shouldn't advertise on english site if you don't offer translation. Not that there's a lot to translate! You would access a larger number of players!