Indeed, predicting the future is a powerful ability, and it's unquestionably a bug-level feature even in a game, likened to a cheat if it were to appear in an anime protagonist.
But it happened to manifest in an almost danger-free ordinary world, and the side effects it brought were unbearable for the ordinary Kagura Hikaru.
The timing of the prophecy's activation was uncertain, and during its activation, his body would completely lose consciousness for several minutes.
No one could predict when he would suddenly zone out; if it happened on the street and he got hit by a car because of it, it wouldn't be surprising, and it was inconvenient in daily life too.
Before long, everyone would think he had a brain disease, otherwise why would he zone out so often and be unable to be awakened, evidently abnormal.
However, even with an understanding of the consequences, Kagura Hikaru had no way to cope because he couldn't find a way to turn the ability off.