I agree with your statements about the dad and how it was put in the story.
(What if the story went like this for the dad. He was always in contact with them and still cared for them but dissappeared the same day dugeons came to be or something along those lines.)
Also the ending felt a bit rushed to me I guess or I am imagining that.
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Hopefully there's another type of continuation to it bc i love this. (≧∀≦) Plus there are some things I am curious about. Such as who was the master that the black knight monster spoke of. (I could only guess a demon king but what if it was some type of other entity. )
Besides that I wish that Haru had a type of dragon type transformation too since Touka had one. Since dragons in this type of genre have crazy high levels of mana and physical attributes.
I don’t care about how at the end of the day his abandonment of his kids is justified in this manga, he abandoned them with no food money or identification papers (they didn’t have passports to go to america and no way to get them).
If a war broke out and they tried to get out of the country they’d literally have no way to do so. Also, the barely had any access to food and could have starved to death while he was “defending them” from dungeons… dungeons in AMERICA. They could have gotten sick with no money for healthcare, been kidnapped when someone figured out there were two young kids living on their own with no relatives but noooo he was protecting them all along. Happy times all is forgiven :)