Ren Takeshi was an amateur volleyball player. Despite his passion for this sport, he never had the physical or technical qualities necessary to shine. His teammates appreciated him for his good humor, but he remained in the shadows, a substitute with average talent. He had resigned himself to a monotonous life after leaving volleyball. One night, after a failed workout and a nostalgic anime viewing of Haikyuu!!, Ren fell asleep wondering what his life would be like if he had been a sports genius

When he opened his eyes, the world around him had changed. He was no longer at home. He was on a volleyball court, wearing an unfamiliar jersey. The walls of the room had a banner that read :

<< "Aoba Johsai High". >>

Around him, players with familiar faces were warming up. It took Ren a moment to understand: he was in the Haikyuu!! universe. But that wasn't all. His body seemed different, more powerful, more fluid. When he grabbed a ball from the ground and made a few moves, he realized that he had acquired New abilities. The control, the agility, the impressive relaxation, the extrem power... It was all there. And a mischievous smile, like Gojo Satoru, appeared on his face.

Ren: "So, this is how a genius feels..."