[EvilSociopath323]

　[勇者なんてもんになっちゃってるけど、元はどこにでもいる普通の少年。
　だから、きっと世界の命運なんて背負えない。]
Yeah. I bet she challenged fate one time too much.

And I claimed this some time back now but there is a chance Ariel gets defeated by Shun if they fight. It was revealed that the hero system works in a way that gives the hero a sudden power up depending on the strength of the demon king when they fight. Well of course he'd have to first get to her. Also would be interesting to know if the power up stays after he defeats the demon king or not.

This reminds me of the side side story. Probably what stood out the most for me was how Shun viewed Wakaba. He felt some sort of anxiety when near her, some negative aura. Seemed to me like foreshadowing that Shun will most likely oppose Shiro even after finding out about taboo. Maybe he'll show some guts in the end after all. Literally.