Secret: Klein, We Are Friends

When we first met, she was a good friend of Klein. She came to Tingen City and became his mentor and friend; when we met again, Klein died because of the arrival of the true creator. She went back in time, but only saved his captain Dunn. Only then did he discover the fate that had been arranged for him. So, as a friend, she decided to go with him and become a witness on his journey to becoming a god. I just don't know when it started, but this friendship seems to have deteriorated?