Futakoi:<br /> Twins daughters of a veterinary doctor and in the story they help their father in the clinic. Nozomu meets them when he takes Billy to the vet clinic after he ate a fax addressed to Nozomu which got it stuck in his throat. [Wikipedia]<br /> <br /> Futakoi Alternative:<br /> Ui Chigusa and her twin sister Koi Chigusa run a veterinary clinic. They request the aid of the Futaba Detective Agency to track down a missing dog. <br /> <br /> (Source: Wikipedia)<br /><br />