Quick answer — Shizuka Ishikawa voices Kamui Katsuragi in Cardfight Vanguard, Sagin in Haré+Guu.
Shizuka Ishikawa voices Kamui Katsuragi (Cardfight Vanguard), Sagin (Haré+Guu).
Kamui Katsuragi is voiced in Japanese by Shizuka Ishikawa.