Director Yuki Kano responded to the controversy in a recent interview: "The exclusive episode is not the 'true ending.' It is an alternate universe. The TV ending is for those who need hope. The 241129 version is for those who want the truth about sacrifice."
Yeah.
Digital-only exclusive versions with enhanced resolution or colorized pages. 241129 shounen ga otona ni natta natsu episod exclusive
He hides the letter under his pillow.