Case Closed Vol 15

Case Closed Vol 15 by Gosho Aoyama. A Mystery manga rated Older Teen, published in English by Viz Media in 2001.

Teen detective Jimmy Kudo is poisoned by a mysterious crime syndicate and shrunk into the body of a child. Hiding his identity as Conan Edogawa, he keeps solving baffling cases while hunting the men in black who did this to him. One of the longest-running mystery manga ever.