Finding the right moment in Yandere Simulator isn't just about stealth; it's about timing. Honestly, if you've been trying to figure out how to read Osana's diary, you already know the stakes are high. One wrong move and Senpai’s childhood friend—or worse, Raibaru—will have you cornered. This isn't just a piece of flavor text. It's a mechanical necessity if you’re planning to use the matchmaking elimination method or if you just want to ruin her reputation by putting her deepest secrets on the school bulletin board.
The diary isn't just sitting out in the open. You can't just walk up to Osana Najimi and ask to see her notes. It requires a specific sequence of events that most players mess up because they get impatient.
The exact location and the Raibaru problem
First off, you need to know where the thing actually is. Osana keeps her diary in her bookbag. During the school day, that bag stays glued to her or sits right next to her desk in Classroom 2-1. But here is the kicker: you can’t touch it while she’s there. And you definitely can’t touch it while Raibaru Fumetsu is standing guard like a human brick wall.
Raibaru is the real obstacle. She’s invincible in a direct physical confrontation, and her "Indestructible" persona means she’s hyper-aware of everything happening around Osana. If you try to interact with Osana’s belongings while Raibaru is in line of sight, it’s game over for that run. You need a distraction. Or a very specific window of time.
Monday is your best bet
Most players find that Monday lunch is the sweet spot. After the morning classes end, Osana and Raibaru head to the rooftop to eat. They talk. They vent. It’s a whole thing. However, Osana leaves her bag behind in the classroom. This is your window. But don't just sprint in there.
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There are other students. Students like Kyuji Konagawa or the various members of the obstacles group might be lingering. You have to wait until the classroom is empty. Usually, around 1:15 PM in-game time, the coast is relatively clear. You sneak into Classroom 2-1, find the desk with the pink bag, and the prompt to "Read Diary" should appear.
Steps to successfully reading the diary
- Wait for Lunch: Specifically, wait for the bell to ring and for Osana to exit the room toward the roof.
- Monitor the Hallway: Ensure no teachers or Council members are patrolling near the door.
- The Interaction: Approach the desk. Hold the interact button. Ayano will take a moment to skim the pages.
It feels fast, but in-game, those seconds matter. Once you’ve read it, the information is stored in your "Student Info" or "Hints" menu depending on your current build of the game. You now know her "dark secret."
Why the secret matters
You might wonder why you're even doing this. In Yandere Simulator, information is a currency. By learning how to read Osana's diary, you unlock the ability to sabotage her interactions with Senpai. Specifically, you find out she’s being harassed by a stalker or has a specific insecurity.
If you’re going for the Matchmaking elimination, you need this info to tell her suitor (Kyuji) what to talk about. Without the diary info, you're just guessing. And guessing gets you a rejected confession on Friday.
Common mistakes and how to avoid them
People get caught because they forget about the "Sentinels." Students in the hallway have a vision cone. If you are crouched over a bag that isn't yours, they will get suspicious. It's kinda funny how many people forget that the Student Council—especially Akane or Kuroko—patrol the second floor frequently.
- Don't do it during class. Obviously.
- Don't do it while Raibaru is nearby. She will break your arm. Literally.
- Check for the "Radio" distraction. If the room isn't emptying out, use a radio or a giggle to lure students away from the door.
Sometimes the prompt doesn't show up. This usually happens if you haven't triggered the initial event where Osana mentions her diary or if you're looking at the wrong desk. Osana sits in the middle row, towards the back. Her desk is usually identifiable by the custom accessories or the sheer proximity to where she stands during the morning.
The "Stalker" subplot connection
Reading the diary is the gateway to the "Help Osana" questline. If you want to eliminate her non-lethally by befriending her, you have to know what's wrong. The diary reveals that a guy is stalking her and took her cat.
You can't trigger the mission to retrieve the cat unless you've "learned" about her problem. While you can technically hear her talking about it on the phone behind the school, the diary provides the concrete proof Ayano needs to use that information as leverage. It’s about building a bridge. A creepy, manipulative bridge, but a bridge nonetheless.
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Using the info for reputation destruction
If you aren't feeling helpful, the diary is a weapon. You can take the secrets you've learned and post them online. This lowers Osana's reputation significantly. If her reputation drops low enough, she’ll be bullied. If it drops to the bottom, she might even stop coming to school.
It’s a slower burn than a knife, but it’s much cleaner. No blood. No disposal. Just a girl whose life is ruined because you looked in her bag.
Does it work every day?
Technically, yes, you can read it on different days, but the information doesn't change much after the first time. The game treats the "Reading" action as a flag. Once that flag is checked, you have the "Secret" in your inventory of knowledge.
Expert tips for stealthy reading
If you're struggling with the timing, try joining the Gaming Club. The temporary stat boost to your stealth or the ability to manipulate student behavior can make the classroom heist much easier. Alternatively, the Drama Club masks don't help here—they just make you look suspicious. Stick to the shadows.
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Actually, the best way to ensure success is to use a distraction at the far end of the hallway. Drop a bucket of water or leave a "suspicious" object near the stairs. While the students are distracted, you have a clear 30-second window to get in and out of Classroom 2-1.
Next Steps for Players:
Once you have successfully read the diary, your next move should be to check your phone in-game. Look at the "Secrets" tab. You should see a new entry for Osana Najimi. From here, you can either go to the rooftop and look for the cat-related clues or head to the computer lab to start spreading rumors. If you are aiming for the "Canon" ending or a high-rank "S+" finish in 1980s mode (though the diary mechanics differ slightly there with Ryoba), mastering this specific stealth interaction is a fundamental skill you'll need for every rival that follows. Move fast, stay out of Raibaru's line of sight, and make sure you aren't seen hovering over that pink bag.