A new OVA of "Detective Conan
" was announced to be released on April 18th. The title is "Detective Conan MAGIC FILE 3 ~Shinichi to Ran Mah-jong Pai to Tanabata no Omoide~" and it corresponds to a pre-story of the new movie "Detective Conan Movie 13: The Raven Chaser
". The story is about the memories of Shinichi and Ran in the summers when they were elementary and junior high school students. Another 48min secret chapter is hidden in the DVD and you have to solve the riddles using the internet and the hints written in the extra cards to watch the chapter.
Source: GA Graphic
Source: Conan Official Website