Zeus, a 18 year old boy got sent into reincarnation by our ever faithful Truck-kun and wound up being born as Monkey D. Zeus, Monkey D. Luffy's twin brother.
This is Twins of the Sea remastered. It's going to be different. I'm not going to delete the original though, so go read it if you want to know what changed.
Also this is NOT A HAREM kinda weird right? But Author-sama! I hear you saying If you don't have a Harem it's trash!
Actually, that's not true! There's plenty of Harems out there you can read those instead! WOAH! CRAZY! INSANE! NEVER DONE BEFORE!