What makes Hikari by Hikaru Utada notable?

'Hikari' became a cultural phenomenon in Japan, topping the Oricon charts and serving as the theme song for the video game 'Kingdom Hearts.' Its popularity helped propel Utada to international recognition and showcased her ability to fuse pop with deeper emotional themes. When 'Hikari' was released in March 2002, Hikaru Utada had already achieved significant success with her debut album, 'First Love,' making this single a follow-up to her groundbreaking early work. 'Hikari' solidified her status as a prominent figure in J-pop and expanded her influence into the global music scene.