TOMORROW X TOGETHER release their fourth Japanese single, CHIKAI. The single contains 3 songs, including two Japanese original songs and a Japanese version of "Deja Vu," ? the original Korean version is featured on their 6th mini album, minisode 3: TOMORROW. Limited Edition B (CD+Book) comes in a DigiPack and includes a 48pg photobook, bookmark set, message card (1 of 5 types / Random), and a selfie photo card (Limited B ver.) (1 of 5 types / Random).