Nakajima Mamoru, by coincidence, reunited with Mikuriya Jin, his senpai from his University days. He was invited by Mikuriya to work for his established shop "Nandemo Ya“. Nakajima, feeling as if he was on cloud nine, didn‘t know that Mikuriya was hiding an unbelievable secret!! Taking hold of this opportunity, Nakajima found himself involved in a rather complicated situation!! A work of Takemaru Abiko, one of Japan's leading mystery writers. A thrilling, dramatic mystery!!