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Hi! I remember reading about a girl who is reborn in another girl's (brown hair) body from a story where the girl now a secondary character who dies saving her childhood friend (blond guy) from the attackers somewhere in the forest or a cliff and he apparently also turns back in time and now understand how important that girl was and loves her now. But in the original story he fell in love with I believe red-haired girl who has big powers and is new in the academy. I remember a moment where red-haired even feels hurt when he is cold with her and says something along the lines "I feel like I lost something that was mine". There was secondary guy (black hair I think) who loves the red-haired girl. And the main girl also met another person who traveled into the story and teaches at the academy (white hair I think)
I have no idea how to find this manga and AI cannot help me.