Mark is gone!

During a weekly after-school meeting, Kiki and William saw a mysterious man in black with a strange appearance snatching their friend Mark away, and the two disappeared into thin air in a flash!

For several years, Kiki and William had not given up on finding Mark, waiting for him to return to the team on the appointed day. Until one day, a pocket watch appeared in the utility room, and the whistle that affected their fate finally sounded...

Led by this watch, Kiki and William were drawn into an unexpected and strange country, where they learned clues about Mark's whereabouts, and unexpectedly discovered the real reason for Mark's abduction.

Undaunted by all the difficulties and trials, Kiki and William were determined to find their friend. Could the friendship of three people break through all boundaries and reconnect in a future that was about to disappear?