The second generation was preparing for battle. The battle with Kanto Manji was to take place in a few days. Soya was walking home alone after the meeting, leaving Nahoya behind to chat with Pa-Chin. As he passed by the playground, the younger of the Kawata twins heard a soft singing sound. He turned his head. A person was sitting on the swing, quietly humming something.

Soya's heart began to beat faster. That song. That voice. The last time he heard them was in kindergarten. His best friend was singing that melody. Unfortunately, when Soya graduated from kindergarten, he and his best friend went to different schools and their communication was interrupted. That was thirteen years ago... And now, thirteen years later, he sees that same person, humming that same simple song...

As if enchanted, Soya took a few steps towards the person and extended a trembling hand

You...