ONE PIECE
海賊王
Monkey?D?Luffy
蒙奇?D?路飛
Grand Line
偉大航道
我是要成為海賊王的男人
丗界嗎?昰啊
囬答昰應該選擇追求自由的丗界
在這個遼闊的世界偭前
可笑的夢想將成為妳們前進的方向
提起勇氣,在信念的旗幟帶領下!
世代繼承的意誌,時代的變遷,人的夢
這些都是擋不住的
只要人們繼續追求自由的答案,這壹切都將永不停止!
這個世界在召喚
我找不出壹個理由
阻止壹個男人出海...
有壹個名叫蒙其（猴子）?D?路飛的男孩，在他的童年英雄‘紅發’香克斯的影響下開始了尋找‘壹大秘寶’的航海旅程（或者是“為了要實現與因救他而斷臂的‘紅發’香克斯的約定而出海”）。‘壹大秘寶’是傳說中‘海賊王’哥爾（金）?D?羅傑的寶藏。如要完成這個任務，他必須到達最致命、最危險的海域：‘偉大航道’。路飛先率領著草帽海賊團到達東（藍）海再跨越了偉大航道。他踏著已過世的海賊王哥爾（金）?D?羅傑的足跡，在尋找‘壹大秘寶’的路上跨過壹座座島嶼。在他的旅途中，他的船隊擴大了，有了壹名劍客、壹位航海家、壹名狙擊手、壹名廚師、壹個醫生、壹位考古學家、壹位造船能手和壹名音樂家。（目標成為第壹劍客的索隆，有著非常優秀的航海直覺的娜美，壹流的海上廚師山治，特別愛說大話的烏索普，壹流的船醫馴鹿喬巴，還是小孩時就成為了歷史學家的羅賓，壹流的修船工改造人弗蘭奇，黃泉果實擁有者骷髏布魯克……)
故事線穿插著路飛船隊與另外壹些不太道德的海盜和海軍交手。後者是世界組織的下屬，他們顯然想以終結海盜黃金時期來尋求公正。許多故事幕後描述了世界組織與世上最強大的海盜船隊的微妙的勢力抗衡。
那個有著‘壹大秘寶’的奇幻世界被兩個大洋掩蓋，壹座雄大的叫做‘紅線’的山脈將這兩個大洋分開。
‘偉大航道’垂直穿越‘紅線’，進壹步將兩大洋分割成四個海：‘北藍’、‘東藍’、‘西藍’和‘南藍’。‘偉大航道’周圍有兩條無風帶，
那裏幾乎沒有風和大浪，巨大的叫做海王的海洋生物在那裏繁殖。因為有著那些生物，無風帶能很有效地隔離那些企圖進入‘偉大航道’的人。
除了海軍的船只能利用海石隱形從而穿越，其他大部分人只能利用顛倒山的運河。顛倒山位於‘偉大航道’和‘紅線’的第壹個交叉處，來自四個海的海水流向山頂，在那裏它們匯合成第五條——運河。運河河水匯入‘偉大航道’的前半部分。在‘偉大航道’的第二部分，在它和‘紅線’的第二個匯合處，那裏被稱為‘新世界’。
A boy named Monkey D. Luffy, inspired by his childhood hero "Red-Haired" Shanks, sets out on a journey to find One Piece, the legendary treasure of the King of the Pirates, Gold Roger. To accomplish this, he must reach the end of the most deadly and dangerous ocean: The Grand Line.
Luffy captains the Straw Hat Pirates first through the sea of East Blue and then through the Grand Line. He follows the path of the deceased King of the Pirates, Gol D. Roger, from island to island on his way to the great treasure One Piece. On his way his crew grows to have a swordsman, a navigator, a sniper, a cook, a doctor, an archaeologist, a shipwright, and a musician.
During the course of the story, the crew contend with both other less moral pirate crews and the Navy. The latter are the subordinates of the World Government, who apparently seek justice by ending the Golden Age of Pirates. Many background story elements involve the delicate balance of power between the World Government and the world's most powerful pirate crews.
The fictional world of One Piece is covered by two vast oceans, which are divided by a massive mountain range called Red Line .The Grand Line, a sea that runs perpendicular to the Red Line, further divides them into four seas: North Blue, East Blue, West Blue and South Blue.Surrounding the Grand line are two regions called calm belts, which experience almost no wind and ocean currents and are breeding ground for the huge sea creatures called sea kings, because of which the calm belts are very effective barriers for those trying to enter the Grand Line. While the navy ships, using sea stone to mask their presence, can simply pass through, most have to use the canal system of Reverse Mountain, a mountain at the first intersection of the Grand Line and the Red Line. Sea water from each of the four seas runs up that mountain and merges at the top to flow down a fifth canal and into the first half of the Grand Line. The second half of the Grand Line, beyond the second intersection with the Red Line, is also known as the New World.