Maybe a story where Banba is injured and Hanabusa has to take care of her. This situation forces them to be in close proximity and they end up sharing their secrets and fears. As Hanabusa nurses Banba back to health, their feelings for each other begin to change.
One plot idea could be that Banba and Hanabusa are on a secret mission together. They face various challenges that test their skills and their relationship. Along the way, they start to understand each other on a deeper level and develop a stronger bond.
To develop Banba's character, focus on her past experiences that made her the way she is. For example, if she had a difficult upbringing, it could explain her tough exterior. For Hanabusa, explore his dreams and ambitions. This can give depth to his character.
Since I haven't read this particular 'akuma no riddle banba fanfic', it's hard to say for certain. However, generally in fanfics for 'Akuma no Riddle', they often explore the relationships between the characters in more depth. Maybe this one with 'Banba' focuses on his backstory, or his relationships with other characters in a way that the original work didn't fully explore.
There are several places to look for this fanfic. Start with the general fanfic platforms. AO3 is known for its large and diverse collection of fan - created works. It has a good tagging system, so if you search for 'Akuma no Riddle' and 'Banba', you might get lucky. Another option is to join 'Akuma no Riddle' - related forums or groups. Fans in these communities often discuss and share fanfics among themselves. You can also try using search engines, but be specific in your search terms to get more accurate results.
A plot idea could be to create an alternate universe where the assassination game has different rules. Maybe instead of one - on - one assassinations, it becomes a team - based competition. This would change the dynamics between the characters completely.
One idea could be that Tokaku and Haru go on a journey outside the school setting. They encounter various challenges that test their relationship and loyalty to each other. Maybe they have to deal with an enemy from Tokaku's past who is trying to harm Haru.
A possible plot element could be a mystery that Tokaku and Haru have to solve together. This would play on the 'riddle' aspect of the original 'akuma no riddle' concept.
One possible plot could be that Isuke and Haruki start off as rivals in the dangerous world of Akuma no Riddle. They might be competing for a certain goal or mission. As they interact more, they gradually discover they have more in common than they thought. Their relationship then evolves from rivalry to friendship and perhaps something more romantic as they face various challenges together.
Another place is FanFiction.net. There are some really good and unique 'Akuma no Riddle' fanfics there. Just use the search bar and type in 'Akuma no Riddle' to find relevant stories.
One great 'Akuma no Riddle Fanfiction' is 'The Unspoken Bond'. It delves deep into the complex relationships between the characters. The author does an amazing job of exploring the emotional depth that the original series only hinted at.
A plotline could be that Haruki gets into trouble and Isuke has to save her. This event could be the catalyst for their relationship to develop. Isuke, being brave and resourceful, manages to rescue Haruki from a dangerous situation, and in the aftermath, they start to see each other in a new light. It could also be that they are both outsiders in their school or group in the Akuma no Riddle setting, and they find solace in each other's company, leading to a romantic relationship.