S1OVA3 Rin and Nitori, a Week With Us!

Rin and Nitori, a Week With Us! (凛と似鳥の一週間！Rin to Nitori no Isshuukan!) is the third original unaired short movie that came with Free! vol.3, which was released on November 6, 2013.

Synopsis
Rin Matsuoka attempts to organize Aiichiro Nitori and his messy desk.

Story
Just before midterms, on a Monday, Aiichiro announces he's completed writing and arranging his schedule for the following week. As he shows off his work to Rin, who is reading quietly on his bunk, Rin takes note of Aiichiro's messy desk. Aiichiro thanks Rin for his concern but, in the end, keeps his desk as it is claiming that he knows where all his books and school supplies are without fail.

On Tuesday, however, Aiichiro's desk accumulates more books and papers and he has a hard time shuffling through them to find his dictionary. As the boy mumbles to himself, Rin, who is once again reading from his bunk, growls in annoyance just before Aiichiro asks him to look over his English reading homework. Though irritated, Rin takes Aiichiro's assignment book and helps him translate a sentence which reads, "Now is the time when I must try hard." Aiichiro comments on Rin's proficiency just as Rin once again comments on Aiichiro's messy desk. Promising to organize it, Aiichiro again tells Rin not to worry.

Wednesday comes and Aiichiro's desk is now cluttered with piles of books, folders, and even a couple of stuffed animals. Rin reprimands him, but calms down in a moment of surprise when Aiichiro explains that he keeps many things out of sentimental value. Shortly after, Rin spots a little box amidst the clutter which he opens up to reveal a bit of Aiichiro's left over umbilical cord. The days ends with Rin yelling at Aiichiro to leave those sorts of things at home.

On Thursday, the books on Aiichiro's desk have piled up extremely high and Rin, exasperated, once again tries to convince Aiichiro to clean up. The other boy protests, however, and explains that he needs every single file and notebook for his midterm studies. Rin later spots a light blue notebook atop one of the book piles and opens it up to find old science notes Aiichiro wrote when he was in grade school. Before Aiichiro can go into detail about why he kept the notes, Rin tosses the book at his face.

With the week over, Aiichiro struggles to dig through his mess for his class notes and when he finally finds them, he accidentally knocks over one of the piles. As a notebook touches Rin's foot, he abruptly stands up and grabs Aiichiro by the head with an iron claw grip. Rin states he can no longer wait for Aiichiro to clean up after himself so, in the end, he cleans up for him, putting items away in the cupboard, drawers, and even a saucy magazine in Aiichiro's bed. Unfortunately, Rin's hard work does not last long and Aiichiro's desk returns to being covered in clutter the following Monday.

The short ends with Rin asking Swim Captain Seijuro Mikoshiba for a new room assignment just as Aiichiro bursts through their dorm room, begging for him not to leave.

Characters
List of characters in order of appearance:
 * Aiichiro Nitori
 * Rin Matsuoka
 * Seijuro Mikoshiba

Trivia

 * Prior to Free!'s English DVD release by Funimation the episode was called 'Rin and Nitori's Week!' in English