One Piece: Koby-ni no Kobiyama - Uri Futatsunagi no Daihihou  

Chiyoko-chan wa Dojicchau, Kobiyama, Who Looks Like Koby: Two Piece in a Pod, ONE PIECE コビー似の小日山 〜ウリふたつなぎの大秘宝〜

The manga revolves around a normal student that looks like the popular One Piece character Koby.Included one-shot:Volume 3: Chiyoko-chan wa Dojicchau