You could also write a fanfiction about a love story that blossoms during the 30 days of night. A human and a vampire falling in love, despite the chaos and danger all around them. It would add an interesting twist to the horror theme of the original.
Another interesting angle could be a different group of survivors during the 30 days. How they cope, what strategies they use to stay alive that are different from the ones in the original story.
One idea could be exploring the backstories of the characters more deeply. Maybe delve into their lives before the events of the original story. Another could be creating an alternate ending where different choices lead to a completely different outcome for the characters. For example, if a character who was a villain in the original story could be redeemed through different circumstances.
One idea could be a group of friends going on a 2 - day 1 - night camping trip. They encounter various challenges like bad weather and getting lost, but also have a lot of fun moments around the campfire sharing stories. Another could be a couple's romantic getaway for 2 days and 1 night. They visit beautiful places, have candle - lit dinners, and strengthen their relationship.
One idea could be exploring the psychological changes of the characters during those 30 days. For example, how they cope with the lack of light and the isolation it might bring. Another could be creating new relationships or alliances that form specifically because of the 30 - day situation.
You could write a fanfiction where the '100 days' are not consecutive. Maybe there are gaps in between due to some unforeseen circumstances like a war or a political upheaval. This would create a more complex and interesting story arc as they try to reconnect during those breaks.
One idea could be to cross Dog Days with a popular magical girl anime. For example, the characters from Dog Days could meet and team up with the Sailor Scouts. They could combine their powers to fight a new, powerful enemy that threatens both their worlds. This would bring a fresh dynamic as the Dog Days characters' combat styles are quite different from the magical attacks of the Sailor Scouts.
One idea could be exploring what happens if the infected start to regain some of their humanity. Maybe a group of survivors discovers a way to reverse the infection slightly in some of the infected, leading to a tense co - existence situation.
One idea could be to create a story where a new character from our world is suddenly transported to the world of Dog Days. They could have unique abilities that disrupt the normal balance in the land, leading to new adventures and friendships. For example, they might be able to control an element that doesn't exist in Dog Days, like electricity. Another plot could revolve around a character from Dog Days visiting our world and experiencing modern technology for the first time, with all the confusion and hilarity that would entail.
One idea could be exploring the backstories of the characters in more depth. For example, delving into the past of the main character and how it shaped his present actions and relationships. Another could be creating an alternate universe where the events in the original story take a different turn, like the two main characters meeting under different circumstances. A third idea is to focus on a side character and tell the story from their perspective, showing how they view the main events and relationships in the story.
Another interesting approach could be to write a fanfiction from the perspective of the setting itself. The landscape, the small town, could be given a voice and a personality. It could tell how the events of the story impact it and how it in turn influences the characters. This would give a unique and fresh take on the 'Magic of Ordinary Days' story.
Perhaps a story where a secret society meets only in the dark of night. The main character stumbles upon their meeting and gets drawn into a world of secrets, power struggles, and ancient rites.