Ussop left the crew In water 7, after Luffy decided to get a new ship and replace the going Marry because it was deemed broken beyond repair...Ussop fought luffy.he lost. Then he left the crew He left you, his best friend. The one who would listen to his lies and storys eagerly. The one who would constantly praise his new inventions and his sniper skills...he left you You didn't accept that. You couldn't accept that. So you went to find him during a rainy night...all alone...