Just before the finals between Seigaku and Rikkai, Akutsu returned to his country and saw a match between Echizen Ryoma and Sanada. Echizen suffered a disastrous defeat. After the finals with Rikkai, Akutsu joined Seigaku...
Just write blindly and follow the main line of the anime. The main CP is Akutsu x Echizen Ryoma, and there are also Oishi x Kikumaru and Momojo x Begonia~