The ending of the Haikyu manga sees the main characters having accomplished their goals and leaving a lasting impact on the volleyball world. It wraps up their stories in a satisfying way.
One popular 'haikyu fanfiction' story could be those that focus on the character development of Hinata outside of the regular matches. For example, some fanfictions might explore his life at home, his relationships with his family members, and how that impacts his growth as a volleyball player. Another type could be the ones that create alternate universes where the teams have different dynamics or face different challenges in the volleyball world. There are also fanfictions that center around the friendships between the characters, like Kageyama and Hinata's evolving bond in new and unexpected scenarios.
Celebrating Years Season 2, episode 13 was the 13th episode of Celebrating Years Season 2. The play told the story of a young man with a mysterious background, Fan Xian. He had experienced the trials and tempering of his family, the martial world, and the court. He upheld justice and kindness and began a new journey in life. In this episode, the news of Fan Xian using the name of investigating corruption to target the Second Prince's faction spread like wildfire in the Jingdou officialdom. At the same time, the murderer of Baoyue Brothel was finally caught. The battle between Fan Xian and the Second Prince was becoming increasingly white-hot. Baoyue Brothel became a tool for the Second Prince to check and balance Fan Xian. The Second Prince tried to pull Fan Xian into the water and cause the people to boil. Fan Xian walked the path of being close to the people. What he valued more was the will of the people. Fan Xian asked his subordinate Deng Zi Yue to spread the word that the manager of Baoyue Brothel was Yuan Meng, and Yuan Meng was an old lover of the Second Prince's subordinate, Li Hongcheng. This was the reason why the Second Prince was framing Fan Xian. Fan Xian and the Second Prince displayed two countermeasures. Fan Xian walked the path of being close to the people. What he valued more was the will of the people. Therefore, Fan Xian asked Deng Zi Yue to spread the word that the manager of Baoyue Brothel was Yuan Meng, and Yuan Meng was an old lover of the Second Prince's subordinate, Li Hongcheng. Anyone with a brain would think that the Second Prince was framing Fan Xian. As for the details of the specific plot, one had to watch the 13th episode of the drama to understand.
The main differences are in the visual presentation and some minor tweaks in character expressions. But the core story and plot remain largely the same.
One great Haikyu and One Punch Man fanfiction could be where the characters from Haikyu find themselves in the world of One Punch Man. They might be shocked by Saitama's incredible strength. Another could be a crossover where the volleyball skills of the Haikyu characters are used in a unique way in the One Punch Man universe, like to defeat some of the monsters in a really creative way.