Akaku Atsui Kodō

"Akaku Atsui Kodō" (赤く熱い鼓動) 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. The song served as the theme song to the Japanese tokusatsu television series, Ultraman Nexus.

Certification and sales
! scope="row"| Japan (RIAJ)
 * None
 * 21,854
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