Sairyoku had already discovered the secret behind Tsukasa ending Tsukasa's immortality but it was not due to the manga in his past life. Even in the manga, it wasn't fully disclosed since it was just theories.
Dimensional Chat Group: In Tonikaku Kawaii With Sign-In System
In the new chapters of the manga nasa found out the secret behind her immortality and is now thinking about telling her
Sairyoku had already discovered the secret behind Tsukasa ending Tsukasa's immortality but it was not due to the manga in his past life. Even in the manga, it wasn't fully disclosed since it was just theories.
Dimensional Chat Group: In Tonikaku Kawaii With Sign-In System