"Akaku Atsui Kodō" (赤く熱い鼓動, lit.

"Red Hot Beat") is a song by Japanese singer-songwriter Rina Aiuchi.

It was released on 4 May 2005 through Giza Studio, as the lead single from her fifth studio album Delight.

The song reached number seven in Japan and has sold over 21,854 copies nationwide.

[1] The song served as the theme song to the Japanese tokusatsu television series, Ultraman Nexus.