Disguised: Story Of A Swimmer Girl (Free! x OC)

Gou's forgotten childhood friend, Ayumu Takahashi is an orphan who is the top multi-skilled swimmer of a girls' school outside Iwatobi. Her sorrowful past regarding swimming, results into a dark personality within her and makes her swim only to win. Being convinced by captain Seijuro, she joins Samezuka Academy's swimming club wearing a hoodie and vows to surpass all the top swimmers in order to avenge for her past.
But can Ayumu really handle swimming and dealing with the guys she despises? How long it will take for Haruka, Rin and their friends to reveal the face of hoodie wearing swimmer? And what will happen after that? Read to find out! OC x Various.