Rihito decides to receive the operation to turn him into an Ace. This is the decisive moment in history that the time travelers wanted to change, but knowing what they know now, they cannot agree on what is best for everyone.
That's enough of a reason
to not be able to stop things!
ist Grund genug, ihn nicht aufzuhalten.
C’est pour ça que tu l’as pas arrêté.
C’est tout.