ONE PIECE（ワンピース）【15巻】

我らを信じてまっすぐ進め!!　巨人達の言葉を信じ、次の島へと突き進むルフィ達。だが、ナミが病気にかかってしまい、船は一路、医者探しの旅へと向かうが...!?　"ひとつなぎの大秘宝（ワンピース）"を巡る海洋冒険ロマン!!

"Believe us and go straight ahead!" Luffy believe in the words of the giants and push forward to the next island. However, as Nami suffered from illness, the ship headed for a journey to seek a doctor one way ...!? Ocean adventure romance surrounding the "Great treasure (One Piece)"!