Astral Odyssey: Dying Ember
Eventually, when Aimi gathered them together to talk about their reasons for joining the school and her dream to find the legendary stone, Naoko became sure that he was the same boy from years ago.
His name was Tadashi Ito.
Tadashi was a nice person and was the only one who was still friendly with her even after learning her name. Every time someone learnt her last name, they would identify her as the famed child who caused her parents' death.
She gradually grew to like him and silently carried a torch for him. Overtime, she noticed that Aimi may also have feelings for Tadashi, so she hid her feelings for him even more than she did.