The letter says that he is used to being alone due to his past experiences.
She has special abilities and can sense and control some mysterious powers, but she hides her abilities and lives a low-key life.
The female protagonist is the same, but the male protagonist will change. Because there will be discrepancies in the timeline, it is not certain whether there is memory.
Cos warning, because although I play the game, I don't read much of the plot, and I don't remember the content very much after such a long time, so if there are any that don't match up, just treat them as private, although they may become a mountain of private.