
Somehow I think that the reason why he changed so suddenly is either his brother/friend pulling the strings or he actually had the same experience as she had now, going back in time and tried to prevent a future we don't know of.
Maybe she was to die on the day he locked her in and died instead of her :/

YES! Finally someone who understands the charm of Tsundere! But tbh, I think the gender is important, at least for me. I hate female Tsundere while I love the male Tsundere.

That's cause most of the female tsunderes are thought to be annoying, loud stereotypes that hit the mc but tsunderes aren't actually like that tsunderes are just too embarrassed/shy to be honest. There can even be a tsundere that gives off kuudere vibes, as someone who appreciates (mostly) all deres I had to write this.
This manga gives me the the exact horrible feeling I was looking for! An unrequited love that destiny just won't allow, until the protagonists can finally break free from that fate!
omg I am seeking for that too! Gonna read this because of your comment, thanks ヾ(❀╹◡╹)ノ~
The I'd suggest reading "This Time I Will Definitely Be Happy" too, if you haven't already. It was really heartwrecking in my opinion :)
Thanks a bunch! I def will! (●'◡'●)ノ