One piece. Vol. 25, Skypiea. Part 2 : The 100 million berry man / story and art by Eiichiro Oda ; English adaptation, Lance Caselman ; translation, JN Productions ; touch-up art & lettering, Stephen Rhyse & Hudson Yards.
"First published in Japan in 1997 by Shueisha Inc, Tokyo"--P. facing title page.
Summary
Talk about impossible! Luffy and the Straw Hats have to find a way to sail to an island in the sky, and the only one who can show them the way is known to be a greater liar than Usopp! It won't be easy, but can they trust their lives to someone nobody believes in?!