The reason might be that the manga has elements that don't align with the common expectations of a mystery genre. Maybe it has a mix of other themes or a unique narrative style that makes the 'mystery' label inaccurate or misleading.
Fiction call numbers are typically made based on a specific classification system. This might involve factors like the genre of the fiction, the author's name, or the publication date.
For parents, reading scary stories could negatively impact their mental well-being. It might make them more prone to fear or have trouble concentrating on daily tasks. Plus, it doesn't contribute positively to their parenting role.
Well, when it's dark, our imagination runs wild and scary stories can seem even more terrifying. It can cause a lot of anxiety and make it hard to sleep.