Three collections of special stories bundled with the DVD/BDs. 
Included: 
On Volume 1: Makoto no Nayami! (真琴の悩み！)/Buin Boshuu! (部員募集！) 
On Volume 3: Rin to Nitori no Ishuukan! (凛と似鳥の一週間！)/Rei no Tobikomi Moutokkun! (怜の飛び込み猛特訓！) 
On Volume 5: Rei to Riron to Buumeran! (怜と理論とブーメラン！)/Iwatobi-ke no Ichizoku! (岩鳶家の一族！)/Haruka naru FuriFuri! (遙かなるフリフリ！)

The story revolves around Haruka Nanase, a boy who has always loved to be immersed in water, and to swim in it. Before graduating from elementary school, he participated in a swimming tournament along with his fellow swimming club members, Makoto Tachibana, Nagisa Hazuki, and Rin Matsuoka. After achieving victory, each of the boys went their separate ways. 
Time passed, and in the middle of their uneventful high school lives Rin appears and challenges Haruka to a match, showing Haruka his overwhelming power. Not wanting it to end like this, Haruka, gathers together Makoto and Nagisa once again and brings a new member named Rei Ryugazaki to create the Iwatobi High School Swimming Club in order to defeat Rin. 
(Source: Anime News Network)

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