Upon getting to the first-year building in Monark, you've likely already noticed a stark increase in puzzle difficulty. The second-year building is no different, as a computer puzzle now stands in your way. Luckily, with a bit of guidance, it's fairly easy to overcome.
When you get to the second floor of the first-year building, you will need to head into the computer lab. Once inside, you will be locked inside by another student, Taishi, and gain his student ID, 020211018.
The passcode is the same as the phrase he keeps muttering at the end of his dialouge, ABRAHADABRA. It is mentioned in the library if you have the report on the occult club.
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Type these both into the nearby computer log-in to proceed with the story. Using the ID and password will unlock a file with his secrets. Go to the door again and select the new dialouge option. You will now be able to exit the room, head to the locked classroom, and open it using the key to confront the first ideal.
For more puzzles solutions and Monark guides, check out our Monark section on Pro Game Guides!