Kino haqida
Shiga prefekturasidan Michiko Oshitani Tokiodagi kvartiralardan birida bo‘g‘ilgan holda topildi. Xonadon egasi Mitsuo Koshikava bedarak yo‘qolgan. Ish ustida ishlayotgan tergovchilar, jumladan detektiv Kyoichiro Kaganing amakivachchasi Yuxey Matsushima boshi berk ko'chaga kirib qolgan. Ular Michiko Oshitani va Mitsuo Koshikava o'rtasida hech qanday aloqa o'rnatishga qodir emaslar. Tez orada Oshitani Tokioga bir maktabda o'qigan Xiromi Asayni ziyorat qilish uchun kelgani ma'lum bo'ldi. Biroq, Xiromi Mitsuo Koshikava bilan hech qanday aloqasi yo'q. It seemed that there were no clues, if not for one detail: detective Yuhei Matsushima found a calendar in the room with the body of the unfortunate Michiko Oshitani, in which on the page of each month the name of one of the 12 bridges in Tokyo's Nihonbashi district was written. Upon learning of this, detective Kyoichiro Kagi becomes terribly worried: he discovered a calendar with the same signatures after the death of his mother.