Free! dj - Koneko no Parade

From September Scanlations:

Pairing: Matsuoka Rin/Nanase Haruka

Rin and Haruka are kittens living with their owner Makoto, but while they seem to get along well enough now, Rin’s former owner Sousuke warns Makoto that soon those kittens will start to grow up…and their happy little playtime may turn into something more serious.