Osana Najimi is the first official rival of Yandere Simulator. She is a "tsundere", a character that acts rude and haughty normally (tsun), but can become affectionate or shy (dere).
Osana Najimi is the childhood friend of Senpai. She has recently begun planning to confess to Senpai under the sakura tree on Friday.
"Osana and Senpai have been close friends ever since they were very young children. They have always lived next-door to each other, and have always walked to school together.
Despite their closeness, Osana is quite rude and harsh towards Senpai; she is always easily irritated and quick to anger when he is around. The reason for this behavior is because Osana has developed romantic feelings for Senpai, but she is afraid of letting him know how she truly feels about him.
She doesn't want him to know how she really feels about him, so she is mean to him at almost every opportunity. However, her true desire is to confess her feelings to him underneath the cherry tree behind the school...and if nothing stops her, that day will come very soon."
Osana has twintails that are orange with yellow gradient ends. She wears two pink scrunchies with white polka-dots. She also wears a red ribbon on the right side of her head. She wears the default uniform unless customized by the player, along with stockings that match her scrunchies. Her bust size is 1.
Senpai is Osana's childhood friend. She does tend to be a bit bossy to him but they are still friends. She has a crush on him, which makes her one of the rivals that Yandere-chan must eliminate in order to obtain Senpai for herself.
Yandere-chan sees Osana as a rival for Senpai's affection, and she will do anything to eliminate her, no matter what it takes.
Info-chan would like to see something bad happen to Osana, but it is unknown why she would want such a thing.
Since she is still not fully implemented into the game, it is still unknown. However, before the January 3rd, 2017 Build, her routine looked like this if the Students.json file was modified to include her:
At 7:00 AM, she walks to school along with everybody else. She's the last one to enter the school gates. She goes to the Courtyard and talks to Senpai while he is reading his book.
She remains near Senpai with her idle tsundere pose and receives her phone call at 7:30 AM, similar to Kokona's. She heads back to Senpai and attends class in Classroom 2-1. At lunchtime, Osana remains in the classroom and does not leave even after class dismissal.
If you use mods and add her back in on the January 3rd, 2017 build or later, she will walk into school, change her shoes, and stand near Senpai until classtime. At lunchtime she will go to the roof and eat bento with Senpai on the bench where the Basu sisters used to sit, then she goes back to class once lunch is over.