"Splash Gold —Natsu no Kiseki— / Prism of Eyes" is MAX's 30th single under the Sonic Groove label. It was released on August 2, 2006 and was their first single to released as a CD single and CD+DVD single. "Splash Gold -Natsu no Kiseki-" is a midtempo pop song with Okinawan folk influences. "Prism of Eyes" was used as the ending theme to Tokusatsu series Madan Senki Ryukendo and is in the style of music used regularly in such programming. It is the last single to feature vocals from former member, Aki, before she left the group on August 31, 2008.