Daisuke Ono & Hiroshi Kamiya as the voice actor on the same series

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great-blaster:

Theme song “Water Surprise" for FREE! radio, sung by Nanase Haruka (CV. Shimazaki Nobunaga) and Tachibana Makoto (CV. Suzuki Tatsuhisa). Full version of this song will be available as a coupling in the Ending song single.

They also announced that they’d just finished recording a radio CD with Matsuoka Rin (CV. Miyano Mamoru), so looking forward to hearing more info about that in the future. (^_^)v