Welcome to the Ballroom - Season 1 Episode 10 Voltage
Overview: Watching Tatara and Mako perform, Gaju recalls events from his past -- Mako coaxing him into taking his first dance lesson, hearing encouraging words at a junior tournament, and being advised to find a partner other than Mako as his dancing skills developed. Now, dancing with Shizuku, Gaju realizes what a huge impact a partner can make. But suddenly, he loses focus and his ability to lead!