Anime: Ballroom e Youkoso (Wellcome to Ballroom)
Anime Scene: Chinatsu leading Tatara in Ballroom dancing for the very first time (Episode 13)
Cover by: pinkuno joandes
The background OST where Chinatsu is leading Tatara in doing the ballroom dance is cute but quite badass at the same time. And that scene is pretty funny though. XD
Played by ear.