The ultimate battle of wits that took the mystery world by storm!

Mato Imoriya. High school student. Absurdly good at winning.

She and her friend Koda find themselves dragged into a series of psychological mind games inspired by classic children's pastimes:

"Mine Glico," where players predict hidden traps as they climb a flight of stairs.
"Free-Verse Rock-Paper-Scissors," where players can invent custom moves on the fly.
"Daruma-san Counted," where steps and call-out syllable counts are put up for auction.

Facing off against formidable rivals, Mato risks what she cannot afford to lose. What is the true reason she refuses to fail—?

A thrilling, heart-pounding masterclass in high-stakes mental warfare!