
Quick answer — "Akatsuki no Kaleido Blood" by Kishida Kyōdan & The Akeboshi Rockets is the opening theme of Strike the Blood IV.
"Akatsuki no Kaleido Blood" by Kishida Kyōdan & The Akeboshi Rockets is the opening theme of Strike the Blood IV.
"Akatsuki no Kaleido Blood" is performed by Kishida Kyōdan & The Akeboshi Rockets.