The "Young Heisei Ellery Queen" tackles everyday mysteries!

Classrooms, the cafeteria, school clubs, and the summer festival—a high schooler's daily life is brimming with wonder.

Tenma Urazome, Yuno, and their Kazagaoka High classmates arrive at the local summer festival. Takoyaki, shaved ice, water yo-yos—no matter which stall they buy from, why does their change always include a 50-yen coin?

In addition to the title story—inspired by the classic mystery homage The Twenty 50-Yen Coins—the "Young Heisei Ellery Queen" takes on a series of baffling everyday puzzles.

Featuring five stories in total: "A Bowl with an Extra Color," which brilliantly solves the mystery of an abandoned bowl left just outside the cafeteria; "Rieko Harimiya's Third Impact," depicting drama within the brass band club; plus a dazzling feat of deduction by Tenma's younger sister, Kyoka.

Following The Murder in the Gymnasium and The Murder in the Aquarium, the third installment in the series is a thrilling, delightful collection of interconnected cozy mysteries!