[For a moment he wonders if she would react different to him leaving if he had just broken up all relationships with her back after the experiment in Valentines... But this is Kotomi, the girl who reads a fairytale to all her plushies every night, who learns about friendship from books and is just the more pure being in the universe. Of course she would be sad, even if she wouldn't be as sad as she would be now.]

Then you have nothing to worry about. I can't ever leave your side, I'm a phoenix, remember? Even if I die, I'll just rise from my ashes and return to your side.