Answer:
The summary you've provided has a mix of horror and humor elements, which can be confusing for a reader looking for a horror story. To make it more serious, you could focus on the eerie and unsettling aspects of the kunai's curse. Here are a few suggestions:
Instead of describing the doomed individuals as "ordinary people during day to day life," you could describe them as "unsettlingly normal," to add a sense of eeriness to the story.
Instead of describing the kunai's curse as something that happens to "ordinary people," you could focus on the fact that the curse affects anyone who comes in contact with the kunai, regardless of their background or circumstances. This could add a sense of randomness and unpredictability to the story.
Instead of describing the visions as "flash[ing] into [Bronte's] mind," you could describe them as "haunting" or "terrifying." This would emphasize the fear and unease that the visions are meant to evoke.
Instead of describing Bronte's and Koa's quest as a "quest to uncover the meaning of the visions," you could describe it as a "race against time" to stop the curse before it's too late. This would add a sense of urgency and tension to the story.
I hope these suggestions help you create a more serious and suspenseful horror story. Remember that horror stories often rely on a sense of uncertainty and a lack of control, so try to include elements that evoke these feelings in your story.