Each stamp has rouletting in the white frame, for making a Detective Conan label without the postage info...
(click image to enlarge)
Released by the Chugoku Branch of Japan Post Co., Ltd. for limited sale - only 20,000 copies. Although the face value of the sheet is ¥820 (¥82 × 10), it sold for ¥1400.
(The Chugoku Branch is located in Hiroshima Pref., and the sheets were basically available in the Chugoku Area - Shimane, Okayama, Hiroshima and Yamaguchi Prefectures.)