Okite Kondeko no Irokenbon (paperback edition) / Nisio Isin

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

"According to the rules, I have taken care of Koniko. If you want her to be returned, prepare one billion yen." placing letter The only employee of the detective office, a kind guard, received a sudden threatening phone call. He is the only one who can rescue the detective. He doesn't have the power of reasoning like Kyoko, but he has "memories" with Kyoko. A guard who starts the investigation by groping. On the other hand, Kyoko wakes up under the criminal? The pure white detective and young guard vs. the jet-black kidnapper! What is the end of the battle of knowledge?