The story takes place six years after the chosen children first came into contact with the digital world. One day in 2005, the waves on the sea surface of Tokyo Port swayed in the morning sun... 17-year-old high school student Taichi Yagami, as usual, stopped the alarm clock in front of him with his hand, kicked away the messy bed, and stretched his limbs while muttering softly. He opened the curtains, and the light shone on a group photo of "that day" on the table. Then he said "Bon voyage, brother" and rode his bicycle out, running towards the blue sky of early summer... Now, the adventure has evolved again...