Hearts2Hearts released the ending theme song for the Japanese broadcast of the animated series "Catch! Teenieping." According to their agency SM Entertainment, Hearts2Hearts released "Candy Box Lover," the ending theme for the Japanese broadcast of SAMG Entertainment's animation "Sweet and Sour Catch! Teenieping," on the 11th. "Sweet and Sour Catch! Teenieping" is the fourth season of the "Catch! Teenieping" series, and Hearts2Hearts took on the ending theme after also singing the opening theme for the Japanese broadcast. "Candy Box Lover" is an electro-pop song expressing the excitement and flutter of opening a box of sweets, adding the animation's world to Hearts2Hearts' bright and lovely mood. Hearts2Hearts debuted in Japan on August 12 with their first Japanese single "ICONIC HEART" and have continued their activities there with anime theme songs and performances. On November 21 they will appear on the second day of the anime music festival "ANIMAX MUSIX 2026" in Yokohama, and on the 22nd and 23rd they will hold their first Japanese fan event, "Hearts2Hearts JAPAN 1st Fan Event 'READY! S2U'," at Ariake Arena in Tokyo.