stone ocean
石之海 JOJO的奇妙冒险:石之海 ストーンオーシャン stoneocean
Part 6 of JoJo no Kimyou na Bouken.
Originally serialized in Weekly Shounen Jump from 2000 to 2003 for 158 chapters and collected in seventeen volumes.
It's the last part to take place in the main JoJo universe.