Anchor

A pirate ship docks at Summer Haven, a moderately sized island, it ended up scaring the residents away at first.. but a young Anchor, who worked at a little family shop that sold medicine, didn't seem scared of the captain when he walked in. His name was Slasher and by all means he actually looked quite friendly to her. She offers him medicine and gives him advice about caring for his sick crewmmates. Upon hearing this, Slasher begins to try and promise Anchor a life of love and luxury if he joins her crew.. Anchor, being young and smitten.. Decides after just a day to pack her things and run away to join the crew as a healer. She wasn't great at medical knowledge, but she knew enough to be somewhat helpful. It seemed exciting for her, a change from Summer Haven that was too peaceful and boring.

It doesn't take too long for Slasher's true colours to come out. He was not a Devil Fruit user to anybody's knowledge, instead a Haki user that was desperate to find his own Devil Fruit to get stronger. Slasher was clearly just grooming Anchor so that he'd do work for her around the ship, acting as if he really did love her when all he wanted was to use her. Slasher ended up only getting harsher with Anchor after finding a Devil Fruit but leaving it in reach of a starving Anchor, who had no idea what it was. Slasher wanted to test the limits of Devil Fruit, he wanted to test ways to consume two at once... Though before he could try, Anchor ate the fruit he wanted to use.

On the crew though, there was one person that Anchor could turn to for help. His codename was Leonheart and he was Slasher's first mate. He seemed to genuinely care for Anchor though, and when Slasher would fall asleep at night after abusing Anchor she would escape quietly to the deck, where Leonheart would always be waiting for her. This went on for almost two years until Slasher caught wind of what was going on, and shot Leonheart in the head right in front of Anchor after catching them one night. It was clear from this, that the crew didn't support their captain anymore, and after a few months without Leonheart, the crew began to turn against Slasher. Slasher, in reutrn, killed off his entire crew one by one while they slept. Anchor ran to the deck, sword in hand to try and escape in the storm but was caught by Slasher.

Anchor's final fight against Slasher was brutal, Anchor wasn't a super strong fighter by any means but she managed to hold her own the best she could, she did get critically injured though, she was close to death rather quickly. As Slasher went in to deliver a final blow to her with his sword she activated the power of her Kenko-Kenko Fruit, tranferring her health state onto him. The shock from the sudden injuries that he staggered. He shakily raises his sword to try and hit a lethal blow on her but Anchor deflected it with her own sword. The force was so great that Slasher's sword flew out of his hand. As he was defenseless, crawling backwards on the ship and pleading for his life, Anchor struck him down and chopped his head clean off. She then dumped his body and head into the ocean. When Anchor ends up telling Sanji about this later, she expresses that she didn't even know who she was when she did those things, and she almost regrets it. Usually, Anchor was forced to kill under Slashers orders, it's never something she really wanted to do.

After this, the ship crashed in the storm, and somehow Anchor survived this and was stuck in the rubble of the ship for a long while. It was a pretty ugly wreck, which is why the Straw Hats had stopped to check it out.

Summer Haven arc starts as Anchor is discovered in her shipwreck. She's cold, hungry and very weak. The Straw Hats had seen the huge wreck while sailing and decided to stop by it to take a look. When Sanji takes a look into a part of the ship that seems less wrecked than the rest, he sees Anchor. At first he sees a woman and he's about to react in the Sanji way until he sees her cower slightly. At this, he takes a gentler approach, he talks to her a little and she can only reply in basic ways.. after this Sanji holds his hand out to her, asking her for his trust. Though Anchor is reluctant, she gently takes his hand. This gives Sanji the OK to get closer to her to carry her out o the wreckage. As he carries her, she ends up passing out in his arms as soon as she comes in contact with the sunlight. Worried, the Straw Hats end up allowing her to board their ship and rest in one of the rooms under Chopper's care.
After coming to her senses and waking up, she realises she's on a ship once again and panics. Though when she sees Sanji again, she seems to calm down just a little, recognising that he wanted to save her and really had pure intentions. She explains to him that she cannot stay here, she wants to go home for the first time in years.. Back to Summer Haven. Sanji listens to her intently, but agrees to help her. He tells her that if it's not too far, he will ask Luffy to redirect towards Summer Haven. He wants to help her, and clearly doesn't want to just leave her for dead somewhere.
Summer Haven doesn't seem to be too far away, maybe a couple of days. So during this time, Anchor gets back on her feet and apologises for disturbing the crew. She doesn't want to take up any more of their time, and so they'll part ways at Summer Haven. In Luffy fashion, he decides she should actually join his crew, but Anchor rejects this. For the next few days before arriving at Summer Haven, Anchor talks to the crew, but she's quite monotone and quiet at times. She ends up telling them pieces about her old crew, and how she grew up, but does not mention that she killed or captain nor the abuse she suffered from him.

Arriving on Summer Haven, Anchor's heart drops completely seeing it almost toally destroyed. It looks like a ghost town. Buildings demolished and people laying dead and mutilated. Anchor shows emotion for the first time by jumping off of the ship and running in the direction of her parent's old home. The Straw Hats, not letting her go in alone and very against the idea of even leaving her there in the first place attempt to run after her, with Sanji in the front. Only a few leave the ship, these being Franky for his strength to lift any rubble, Luffy, Nami and of course, Sanji. The rest stay behind to look after the ship and take a look around the surrounding area.
Sanji finds Anchor after running in her direction, stood in front of the house her parents once lived in. It was completely demolished with no sign of life at all. Anchor stays silent as Sanji attempts to talk to her.. But she's mostly just unresponsive. With a bit of a push though, Anchor talks to Sanji a little about her family's history on the island, how the island was friendly and loving, and the only thing that could've done this to Summer Haven was a monster.
It takes a little while for the Straw Hats to travel around the whle island, considering how destoryed the whole area is.. There's no real sign of life at all, as if everything was just destroyed with no mercy. Anchor grows cold, thinking of all the old friends and family that were mercilessly killed, and for what reason?
Tiny time skip to the end of the arc because I'm awful at filler... Turns out Summer Haven was destroyed by a monster. Before dying, Slasher kept a secret. He had the Modoru-Modoru Fruit. This fruit has the ability to return the user to life, reincarnating as anything they desire with their memories in tact. Slasher had chosen a monster that would both get him out of the bottom of the ocean and destroy anything in hi path. He chose to be reborn as half kraken, and he was giant. He was hiding out beneath Summer Haven after destroying it, knowing Anchor had nowhere else to go except there. Slasher's Kraken form is so huge that his tentacles reach around the whole island. As Anchor, Franky, Luffy, Sanji and Nami take on Slasher head on, Zoro, Chopper, Usopp and Robin take care of the tentacles that have reached around to the Sunny. This is the first time we get to see Anchor's sword skils, though sometimes she's caught off balance, she does manage to pull off a good couple of strikes. The final blow to Slasher comes after he's been weakened, his tentacles near the Sunny roughed up and tied together. The tentacles near Slasher's main body are taken a hold of by each of the members near the body, and they wrap his body with them, with no tentacles to help him swim, Slasher sinks to the bottom of the sea, still alive, but suffering down there forever.

As Anchor pays her respects to Summer Haven and those lost in it, Sanji stays close to her. Anchor talks to him about how she regretted leaving Summer Haven back then, how she took her family for granted and didn't realise what she had until it was gone. Sanji asks if if she's been considering joining the crew.. The panel cuts off with Anchor turning around, teary eyed with a smile, the first genuine one she's had this whole time.
Anchor explains how taken aback she was by the support from the Straw Hats, how they helped her get revenge for her home island and put a monster somewhere where he could never harm anybody again. She thanks them, from the bottom of her heart, and vows to fight alongside them, if they'll have her. With that, Anchor joins the Straw Hat Pirates.