Prologue:
Two years have passed since Hiwatari Kei and Krad has been defeated. Along with Krad is Dark Mousy who was sealed away in that final battle. Niwa Daisuke no longer have Dark Mousy, but he still attends on his training insisted by Daiki and Emiko. Towa took her vacation the moment the final battle ended. Kosuke went off for a research about a more powerful rutile that can protect without damaging the other. Satoshi now lives on by himself now that his father was nowhere to be found after the final battle.
Daisuke, Riku, Risa, and the others are now in Junior High School. Daisuke is now 16 years old.
Summer is now over, and classes start within a week. They were all excited for that.
The day of the start of classed has come. Daisuke went off to go to school. On his way to the train station, the neighbourhood greeted him a pleasant morning. A lady suddenly dropped a handkerchief from the laundry up on the window. Daisuke saw that, and hastily responded. Due to the loud bang just then, Daisuke lost his balance. As a result, he hit his head on the stone of the fountain. He lost consciousness for a while. After waking up, he wondered where he is. He was taken by the townspeople to the school's clinic.
Having heard what has happened, Riku rushed to the clinic to see how Daisuke is. Upon entering through the door, she was shocked on the question asked in front of her.
"Uhmm…who are you?" Daisuke asked.