Also known as: 背すじをピン!と, 背すじをピン!と~鹿高競技ダンス部へようこそ~
Full name: Sesuji wo Pin! to ~Shikakou Kyougi Dance-bu e Youkoso~.
A manga in Shounen Jump about a cute, short, shy boy (Tsuchiya Masaharu) and a cute, short, shy girl (Watari Eri) who join a combat ballroom dancing club full of extroverts.