It wouldn't be a flaw, nor would it automatically be good writing. You are confusing the theme with the setting. This isn't an isekai series, or even an urban fantasy series (with vampires and werewolves running around), so it's more likely the supernatural thing was a part of the setting than an actively ongoing theme. A rather more commonplace supernatural setting is the so called regression one, in which the main character's time gets rewound, starting their life again from the beginning (or a certain point in childhood if the author doesn't want to bother with infantile years), now knowing beforehand how they are destined for ruin and thus being able to work against it.