ARC 4 BARATIE (EP 19- 30)
EP 19 - 21 : luffy and ussop hit a floating restaurant with a cannon , we get to see zoro's childhood , he was mostly in a dojo and he was the 2nd strongest with the 1st one being kuina, the daughter of the dojo owner. after losing 100s of times to her , one night they make a promise to be the strongest swordsman , kuina dies the next day from fall off of stairs , zoro inherits kuina's katana .
the crew then meets johnny and yosaku who were zoro's companion some time ago , and they set sail to the baratie restaurant they hit with a cannon , the owner of the restaurant is a former pirate named red leg zeff , who beats up luffy and scolds him for breaking the restaurant , zeff puts luffy to work in which luffy breaks even more things, in the meantime we meet a chef named sanji who is a total simp but also respects food a lot and when a starved pirate named gin arrives , he offers him food despite no money . seeing this , luffy wants sanji to join his crew as his chef but her declines
ep 22 - 26 : gin returns with his starving captain don krieg , sanji gives him some food as well but he betrays them after regaining energy and threatens them to give food to every crew member for free , gin explains that they went to the grand line but encountered a very dangerous pirate , a warlord of the sea name dracule mihawk while krieg attempts to take control of the baratie. during all this , nami steals the going merry and leaves . mihawk arrives at baratie to finish don krieg and his crew but knowing that mihawk is the strongest swordsman , he challenges him to a duel and loses with mihawk using his smallest knife and then for respect for zoro's courage , mihawk slices his torso with his main sword , the black blade , yoru . mihawk leaves after defeating zoro , krieg continues the invasion of baratie and sends pearl , a strong soldier who has never bled in a fight before , sanji kicks him and gives him a nosebleed , pearl gets angry and lights up on fire spreading it all around , after some more kicks from sanji , he is defeated. zeff is then held captive by gin.
Meanwhile , johnny , ussop and wounded zoro go after nami
sanji has to take hits from pearl to save zeff and then we see his backstory (this ones genuinely emotional so watch ep 26)

ep 27 -30 : gin knocks out pearl as he wanted to fight sanji himself , he refuses to •••Show sanji so krieg is angered and unleashes a poisonous bomb for which all of the crew of krieg has masks except gin
the chefs of baratie jump underwater , zeff and others go inside to stay away from the poisonous smoke , luffy takes 2 of the masks and gives them to sanji and gin , he is unable to find one for himself so gin gives his mask to luffy , sanji takes gin away for treatment , luffy then continues fighting krieg and ultimately wins , gin thanks sanji and the pirates leave on a boat .
sanji makes the decision of leaving baratie to go with luffy , and with a heartfelt goodbye from the chefs , luffy , sanji and yokasu leave to follow nami to the arlong park.