Maybe in a post - apocalyptic world, two groups are negotiating for resources. A young man and a young woman from different groups meet during these negotiations. As they try to find common ground for their groups, they develop a deep emotional connection.
A couple who has drifted apart decides to negotiate the terms of their relationship. Through this process, they rediscover why they fell in love in the first place and work towards a stronger, more loving bond.
Show their growth through the negotiation process. If they start off as bad negotiators, they can learn and improve, and this can parallel their relationship growth. They might start making compromises in negotiations which also reflects in their relationship, like learning to listen to each other's needs.
One idea could be a role - reversal plot. Instead of the usual power struggles between Kaguya and Miyuki, have them switch personalities for a day. It would be hilarious to see Kaguya being overly confident and forward, while Miyuki is shy and hesitant.
One idea could be that the two fated lovers are from different worlds, like one is a human and the other is a supernatural being. They meet by chance in a strange situation and start to feel an unexplainable pull towards each other.
One idea could be exploring the backstories of the characters in more depth. Maybe a character has a past trauma related to love that makes them act the way they do in the original story. Another could be a 'what if' scenario, like what if two characters who were enemies in the original fell in love in the fanfic.
One idea could be that Alice discovers a hidden realm within the looking - glass world where all the characters' personalities are reversed. For example, the usually kind White Queen is now a bit cruel. Another could be that Alice has the power to change the rules of the looking - glass world, like making time run backwards. Or perhaps she teams up with the Jabberwocky to overthrow an unjust ruler in that strange world.
One plot idea could be that Madara falls in love with a time - traveler. She comes from a future where she has studied his life. When she arrives in his time, she tries to prevent him from making certain mistakes. Madara is intrigued by her knowledge and her different way of thinking, and love blossoms between them as they work together.
Another plot could be about a family member from 'to love ru family fanfic' who discovers a long - lost relative. This new addition to the family brings in different values and traditions, leading to both comical and heartwarming situations as the family tries to incorporate this new person into their lives.
Another plot could focus on a friendship turning into a romantic relationship. Maybe two characters who have been friends for a long time start to see each other in a different light. They could go through some misunderstandings and challenges that test their bond before finally getting together.
One idea could be that the Queen of Love and Beauty has to prove her worthiness to keep her title. Maybe there are challenges set by the gods that she must overcome, like taming a wild magical beast. Another could be a love triangle where she is caught between a noble knight and a mysterious wizard, both vying for her heart. And perhaps she has to use her powers of love and beauty to heal a broken land that has been ravaged by war.
One idea could be exploring an alternate universe where the main characters meet in a different setting, like a music festival instead of at school. Another could be delving deeper into the backstories of the secondary characters and how they impact the main relationship.