What makes Kira Kira by Ai notable?

'Kira Kira' not only showcases Ai's unique sound but also received significant attention in Japan, reaching high positions on various music charts. The song is celebrated for its infectious energy and has been influential in popularizing contemporary J-pop blended with elements of gospel and R&B. By the time 'Kira Kira' was released in 2017, Ai had already established herself as a prominent figure in the J-pop scene, with several successful albums under her belt. This release marked a continuation of her exploration into diverse musical styles, following her 2015 album 'Moriagatte Utaou'.