Once you finally make it past the Memorial Garden, you will be able to enter the Old Dormitory. This building is rather small, but the puzzle inside shouldn't be taken lightly. To get to the second ideal, you will need to learn a bit of time managment.
There are two safes inside the Old Dormitory. The one with the key is located next to the locked cafeteria door in the main plaza. Besides the safe is a note that talks about earthly desires and is one of the most cryptic puzzles you will face in the game.
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The code to the safe is 1245, and to find the combination, you have to trek around the school looking at clocks, which isn't that fun. Once you put in the combination, take the key, and unlock the cafeteria door, you will find the second ideal.
Luckily, the area's third puzzle is simple, and you only need to revisit the school infirmary to gain access to the third and final ideal.
I start my day by exploring Teyvat in Genshin Impact and end it after reorganizing my apartment in Final Fantasy XIV. I am a diehard fan of N64 era games and will forever feel betrayed that Megaman Legends didn't finish. Outside of gaming, I have spend my time collecting manga, collecting anime figures, and watching anime with my naked cat.