reincarnation story of an assassin

My name is Alice Warren. I was an assassin in my previous life but now I've reincarnated in my fellow assassin's favourite otome game 'Romance at Willow Academy'. I don't know much about this game. I only know the basic plotline and some of the main character's names which I heard from my friend. According to her, the villainess Jade Diamond dies in every route. I have to make sure to avoid all my death flags so I can enjoy my leisurely life as a noble but for some reason, the main characters keep coming to me and even the heroine is completely different from what I know.