The official website for the Kono Naka ni Hitori, Imōto ga Iru! (One of Them Is My Younger Sister!) television anime series began streaming a second promotional video for the series on Monday. The video features StylipS' opening theme song "Choose me ♥ Darling." The video also reveals that the series will premiere on TBS on July 6 at 1:55 a.m.
