During summer break, while his peers enjoy leisure, Kimihiro Watanuki remains toiling at Yuuko's enigmatic shop. As supernatural disturbances wane, he busies himself with chores to repay Yuuko's debts. Yet, a new enigma unfolds when Yuuko is beckoned to a mansion, luring Watanuki, Yuuko, and his schoolmate Shizuka Doumeki into a gathering of eclectic individuals with a shared quest for wish fulfillment. Soon, as fellow collectors vanish mysteriously, Watanuki and his allies must unravel the puzzle swiftly to avert impending peril.