Reigisa

Reigisa is the slash ship between Rei Ryugazaki and Nagisa Hazuki from the Free! fandom.

Iwatobi Swim Club
Nagisa first met Rei when he was trying to recruit the fourth member for his swimming team. He is the only one who asks Rei, and pursues the goal endlessly. As he's watching Rei during pole vaulting, his eyes go wide with amazement and admiration. Later, Nagisa asks to run with Rei, and as they are running, tells Rei that the reason he wants him to join so bad is because he's beautiful. They both blush, and Rei agrees to join as a trial member.

In episode 4, Nagisa held Rei's hands and helped him learn how to swim and overcome his fear. When he sees that Rei is still having trouble, he begs Haruka to teach Rei.

In episode 5, when questioned what his swimming style is, Nagisa pushes himself against Rei's side and exclaims "That's right!" while blushing, implying that he already knew what his swimming style was.

In episode 5, Rei is surprised and saddened that Nagisa does not want to sleep in the same tent as him, and asks Nagisa why he wants to sleep with Haruka instead of him.

In episode 6, when Nagisa realizes that Rei is drowning, he immediately swims towards Rei and screams "I'm coming, Rei!" in an effort to save him. After presumably saving Rei, it cuts to him picking up the kickboard and giving it to him. When Rei begins to blame himself, Nagisa brushes it off and comforts him.

Again in episode 6, as Rei is telling an embarassing story about himself, Nagisa tells him "Don't worry, if you ever leave your underwear in the locker room I'll grab it for you!"

In episode 8, when it's Rei's turn to race, Nagisa expresses concern by asking Rei if he'll be okay with a worried face. Rei reassures him that he does better in competition, and then goes on to race.

At the end of episode 8, as they're meeting up for the relay race, Nagisa and Rei are late together because they were privately practicing by themselves.

Eternal Summer
Rei starts to disappear to someplace mysteriously after practice. The boys ask their coach what Rei could be up too, to which he says that Rei "must've gotten himself a girlfriend" which Nagisa seems very distraught by. Rei turns out to be just getting extra swimming from Rin since he wanted to improve his other swimming strokes.

When Nagisa runs away from home and tries to go to Haruka and Makoto so he can have a place to stay, Rei bursts in the front door and worriedly asks where Nagisa is and how is he. He only calms down when he verifies Nagisa is fine. When Nagisa reveals that his parents wanted him to quit the swim club, Rei responds that he's not letting him leave- since Nagisa was the one who recruited him in the first place.

Dive to the Future
Sprouting Dive Start! A Promise on a Shooting Star! Interference of Loss!
 * Rei asks to take another group photo, since he doesn’t look good in it, but Nagisa sends it, much to Rei’s horror.
 * Rei and Nagisa go to Samezuka Academy to tell about Haru’s tournament.
 * Nagisa jumps and half hugs Rei in excitement.
 * Rei tells Nagisa that their training camp has to be taken seriously once he starts getting over the top ideas.

Quotes
"Where is Nagisa?! I want to see him right this instant!"

- Rei, to Makoto and Haru.

"I'll never allow you to leave."

- Rei to Nagisa, on leaving the swim club.

Songs

 * Summer's End Evening Twillight by Yonaga Tsubasa and Hirakawa Daisuke

Fanon
Rei and Nagisa are an easy and sweet pair to ship. They have a very close relationship with each other which is often reflected in fanfiction. They are often shipped because of their opposing personalities with Rei being a perfectionist and a bit uptight and Nagisa being carefree and childish. Nagisa is also very supportive of Rei and vice versa, and both care deeply for each other, not to mention the show often highlights their close relationship with each other specifically.

Most people ship the two and there is little fighting between it and it's opposing ships. They appear frequently as a background pair for other ships as well. Little dispute is held over if the pairing is likely to happen. Many believing that they are already together. This was increased following their montage of moments from episode eleven of Dive to the Future.

On AO3 it is the most written ship for both characters and the third most written ship in the Free! tag.

Fandom
FAN FICTION
 * Rei/Nagisa tag on FanFiction.Net
 * Rei/Nagisa tag on FanFiction.Net

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Trivia

 * Nagisa's motif animal is a penguin and Rei's is a butterfly.
 * One of Nagisa's reasons for Rei to join the swim team is that Rei has a name that is traditionally for a girl, just like the other three members, and Rin.
 * They are wearing matching diamond ring necklaces in the official art for their character theme song, Summer End's Evening Twilight.