Is the '7 nights of darkness true story' a horror story?
There's no way to be certain. It could be a horror story if the narrative is centered around creating fear and unease through elements like mysterious disappearances, strange noises in the dark, or a cursed location during those seven nights. On the other hand, it could be a story about a scientific exploration during a time of natural darkness, like in a deep cave or during an eclipse, which would not be horror - related at all.
It's hard to tell without more information. It could be a horror story if it focuses on things that are typically associated with horror, such as supernatural events, a sense of impending doom, or a malevolent force that is active during the seven nights of darkness. However, it might also be a story about a real - life survival situation during a period of darkness that isn't horror - related at all.
Maybe. Just because it has 'darkness' in the title doesn't necessarily mean it's a horror story. But it could be if it involves elements like ghosts, demons, or other spooky things that happen during those seven nights.