Abstract

Can you solve these problems? — Take on "tricky problems" that look ordinary at first glance but can't be solved with arithmetic operations or formulas alone!
With a string of shocking twists you never saw coming, both bookworms and reluctant readers are guaranteed to be hooked.
One book that makes reading fun while sharpening both math skills and reading comprehension!
Synopsis
Fifth-grader Kazuto and his friends have built their own secret "base" in a hidden spot — a place just for them, unknown to parents and teachers, where they play games and read manga...
Then older kids take over their paradise!
To get it back, they must solve the math problems the older students throw at them.
The problems look like ordinary math at first. Kazuto, a math genius, breezes through them with ease — only to find each problem is rigged with a trap, and they're outsmarted at every turn!
To reclaim the base and the treasure buried inside, Kazuto and his friends must summon that mysterious girl!

Table of Contents
Chapter 1 — Complete! Our Secret Base
Chapter 2 — Invasion! The Monster Army
Chapter 3 — Showdown! The Golem
Chapter 4 — Clash! The Goblin
Chapter 5 — Incoming! The Wyvern
Chapter 6 — Fierce Battle! Cerberus
Chapter 7 — Descent! The Demon King Satan
Chapter 8 — Speak It! The Forbidden Spell

Author’s Information

Born in 1991 in Kanagawa Prefecture. After attending Kaisei Junior and Senior High School, graduated from the Faculty of Law at the University of Tokyo. Won the Shincho Mystery Prize in 2018 with Elegy for a Nameless Star and debuted in 2019. In 2021, "#PleaseDiffuse" received the Mystery Writers of Japan Award (Short Story category); the short story collection #IWillTellYouTheTruth (2022), which includes that work, became a hit with over 800,000 copies sold. Other works include The Game of National Salvation, The Restaurant with Many Difficult Questions, and The World Will End Anyway.