Acony - Vol. 3 Ch. 24 - A Distant Promise

[MangaDex]

 

[BakedBanana]

"You'll become a highschooler, a college student, a working adult."
"Your life will be about clearing those boring events."
"But as for me, I'm staying here unchanged for the next couple decades." (Page 6)

Reminds me of the ending of Neil Gaiman's, The Graveyard Book.