[citation needed] Halcali also made their American debut in May 2008 as the musical guests of honor at the Anime Central convention.

[3][4] As Halcali did not renew their contracts with Epic Records Japan, they have had no outstanding entertainment activity as a unit as of 2013.

In 2002, Haruka and Yukari noticed a pink flier for an audition to become a "female hip hop unit" which was held by the group Rip Slyme.

[10][11] The time between the release of their first single to that of their debut album Halcali moved away from mainstream J-pop and toward a style combining pop and rap; an airy, self-parody "bubblegum" rap in the vein of earlier groups such as East End X Yuri.

This was evident in their second and third singles, "エレクトリック先生" (Electric Sensei) and "ギリギリ・サーフライダー" (Girigiri Surf Rider) released in mid-2003.