Story
A new sister work from the same team that authored My wife is from a thousand years ago! If you could go back in time, what would you do? I would wait for you at the school gate, wait there every day, and relentlessly pursue you until I win you over. What about you? Hmm... I would wait patiently until I turn twenty-four to meet you again, then proceed step-by-step with dating, marriage, and then I can ask you this question again. I'm proceeding cautiously because I'm afraid the butterfly effect will cause me to lose you."
Synopsis via AniList (English).
