The good end - "We're Together". If you choose to hug Akari, you hug and after the conversation below, Akari reverts back to her true self.
Kazuki:I won't let you be alone. I'll do whatever I can. I won't leave you. Akari:...Really? Kazuki:Yeah. Akari:Really really? Kazuki:Really really. Akari: I'm glad... *slowly fades into her true self*
The final True End, "Mirrored Lovers", and the last message that accompanies it.