Summer High Tension☆

High Summer Tension is the first track of Vol.2 Nagisa Hazuki & Rei Ryugazaki character song duet CD of the Free! anime. It is performed by color = > Nagisa Hazuki and  Rei Ryugazaki's seiyūs, Tsubasa Yonaga and Daisuke Hirakawa. The song was released on January 14, 2014.

Lyrics
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