Well, 'Ao Haru Ride' is a great anime and the idea of a Kou x Futaba fanfic can be really interesting. A good fanfic in this pairing might explore their relationship further. It could delve into their feelings that were not fully shown in the anime, like the small moments of hesitation or the unspoken words between them.
Think about the setting. Since it's from New Game!, you can use the game - development studio setting as a backdrop for many of their encounters. This can add authenticity to the fanfiction. Also, consider their goals and how they support or conflict with each other in achieving those goals. For example, if Rin is aiming for a promotion in the studio, how does Kou react to that? Does he help or is there some kind of friendly competition? Another important aspect is the dialogue. Make it natural and in - character. Don't have them say things that are completely out of character just to fit the plot you have in mind.
One common theme could be friendship. Their relationship might start as friends and develop over time. Another theme could be growth, like personal development of the characters as they interact with each other.
Kou Qianzhi was a Taoist priest of the Northern Wei Dynasty. It was said that before he passed away, he had left behind an instruction to build a temple in the sky to achieve the effect of "inviting guests from the sky and stopping the clamor from floating". Xuan Kong Temple was built according to his teachings and was located on the cliff of Mount Heng. After years of preparation and design, Kou Qianzhi's disciples finally built the Xuankong Temple in the 15th year of Taihe of the Northern Wei Dynasty (491 AD). Xuankong Temple was a temple that combined Taoism, Buddhism, and Confucianism. The leaders of Taoism, Buddhism, and Confucianism were placed in the same hall, reflecting the peace of the three religions. Xuankong Temple's architectural features were unique. It cleverly made use of the structure of the cliff and the mountain, allowing the temple to hang on the cliff to protect it from the erosion of rain and sunlight. As for the specific construction principles and structural details of Xuan Kong Temple, there were still some uncertainties and guesses.
Some other platforms like FanFiction.net might also have New Game! Rin x Kou fanfiction. Just use the search function and type in the relevant keywords. However, the quality may vary, so you might need to skim through a few stories to find ones you like.
One idea could be a story where Kou and Yui go on a journey to discover Yui's past. Maybe they find an old diary that holds secrets about her family and how she ended up in the vampire world. This could lead to a series of adventures and a deeper bond between them.
One common theme could be friendship development that turns into something more. Since they are characters from 'New Game', their work relationship and how it evolves romantically might be explored.
Sometimes, dedicated anime or 'New Game' fan communities on social media platforms such as Reddit or Discord may also have links or discussions about Kou x Rin fanfiction. Members often share their favorite works or know where to find specific pairings.
You can start by looking on fanfiction.net. It has a large collection of 'Ao Haru Ride' fanfics, including those focused on Kou x Futaba. Another option is Archive of Our Own (AO3). It has a great tagging system which makes it easier to find specific pairings like this one.
First, you can start with a simple idea like their first meeting in a different setting. For example, instead of the usual mansion, they meet in a forest. Just describe the scene, how they look at each other, and what they are thinking. Then build on it from there.