Since I have no prior knowledge of what'mere ban jao' refers to in terms of a full story, it could be a personal anecdote, a folktale from a particular culture, or even a made - up story. Maybe it's a story about a journey to a place called 'Mere Ban' where something significant happened. But again, this is all speculation without more information.
In the anime " Purple River ", Shue Purple River ended up together with Frost Flow. Liu Fengshuang was the princess of the Liufeng family. She was beautiful and intelligent, and had high martial arts skills and talent. They were lovers and friends. They could entrust each other with their lives and souls. Their love originated from the story of a hero saving a beauty. Hidekazu Ishikawa saved the wind and frost on a snowy night, and gradually fell in love with each other through taking care of each other and giving each other gifts.
Hidekazu and Wind Drifting Frost finally got together in the anime " Purple River ". Liu Fengshuang was the princess of the Liufeng family. She was beautiful and intelligent, and had high martial arts skills and talent. The crusade army she led was one of the strongest armies on the continent. Hideki Nishikawa and Wind Drifting Frost became lovers. They loved each other and could entrust each other with their lives and souls. Therefore, according to the information provided, Shoutu and Wind Drifting Frost were indeed together.
One idea could be a rengoku fanfic where he trains a new group of young slayers. It could focus on his unique teaching methods and how he instills his values in them.
Tanjiro would be a great character to pair with rengoku. Their different personalities could create an interesting interaction. Tanjiro's kind - hearted nature and rengoku's fiery determination could lead to some great storylines.