Futari / VIVIVID PARTY! (ふたり/VIVIVID PARTY!) is YuiKaori's second single. The single was released on July 21, 2010 in one CD and DVD edition with interchangeable covers. The first press of the single came with 1 random photo card out of 4. "Futari" was used as the second ending theme for the anime Kiss x Sis. The single reached #91 on the Oricon weekly charts and charted for one week, selling 927 copies.