The idea for green onion flavored ginger ale that Mikoto came up with on a whim is chosen as a potential candidate in the Sunlight Beverage new product planning contest. Since Mikoto is still unaccustomed to working at a company, the badminton team arranges a training camp so they can help him. Together they discuss the project as they write up a proposal. And finally, Mikoto opens up to Tatsuru about the traumatic incident he experienced in high school that caused the decline in his abilities.

Traumatized by injuring Azuma at the Interhigh, Mikoto is powerless against Tonozaki Shiryu and Tachibana Azuma's doubles team. Azuma, however, confronts Mikoto head on. With Tatsuru's help, Mikoto and Tatsuru's team gradually regains its form. Their match grows increasingly fierce. Can Mikoto reclaim what he lost...?

Mikoto is confused when Tatsuru suddenly announces he wants to dissolve their doubles team. Tatsuru leaves on a business trip and meets up with his former partner Izumo Naohiro in Kyoto. Meanwhile, Mikoto coincidentally discovers Tatsuru's situation and runs into the world's number one ranked singles player, Ibuki Sentaro of Mitsuhoshi Bank. He becomes distressed when his true feelings are identified. What conclusions will Mikoto and Tatsuru arrive at...?

It's the finals of the S/J League. Their opponents are reigning champions Mitsuhoshi Bank. Usuyama takes on the number one ranked ultimate ace Ibuki Sentaro. Once known as "Usuyama of the East" and "Ibuki of the West," the showdown between these former rivals takes an unexpected turn. Mikoto and Tatsuru take on Kirishima Takuma and Izumo Naohiro in the crucial match. Mikoto and Tatsuru are tossed about by Takuma's overwhelming might...

Mikoto injures his eye. Tatsuru tries to forfeit the match, but Mikoto insists on continuing. Against superior opponents and with an overwhelming handicap, the two of them tenaciously hang on. Mikoto, Tatsuru, Takuma, and Izumo--deep connections intertwine in the S/J League finals. The score between Sunlight Beverage vs Mitsuhoshi Bank will finally be settled!