Osana Najimi was one of the original students before the incident at the Akademi High School in GhoulGirls90's Fanon and one of the two main protagonists in Nightmare Mode of Yandere Simulator: SNAP Mode. She was Taro's childhood friend and Raibaru's extreme close friend.
A tsundere girl who is Taro Yamada's childhood friend and Raibaru's closest friend.
She had a stalker who had a crush on her and was blackmailed for something that would force her to do what they want.
As Osana is a tsundere, she pretends to act rude and harsh towards her childhood friend, Taro Yamada only because she secretly has a crush on him and fears that he might not accept her confession. She is mostly friendlier to her friends.
In Yandere Simulator: SNAP Mode's Nightmare Mode, Osana has a strong sense of justice and is vengeful after the Clown had murdered her childhood friend and the rest of her friends. She acts cowardly at first due to being too afraid to face the killer in her school but eventually becomes brave enough when the Clown taunted about her friends and others being nothing. She is very protective towards Raibaru, Hanako and Amai as she wouldn't want them to die.
Osana had the Social Butterfly persona. She would strike a cute pose if Ayano aims the camera at her. If she witnesses murder, she will run out of school, along with Raibaru and call the police. She cannot also participate the fight.
In Yandere Simulator: SNAP Mode, Kokoro was a bully to Osana at first, but since after the other Bullies' mysterious disappearance, she starts to warm up to her and being friendly, though, Osana still doesn't trust her.
Osana is very disgusted and extremely afraid of the Clown, like others do. She would want to have him brought to justice to avenge Senpai's death but is too scared to do so.