A bright, pop-infused birthday song celebrating the VOCALOID "Ui" (ui)! This cute and comical track tells the story of trying best to bake a birthday cake from scratch, only to realize at the very last minute that the present was left unbought...! Despite the chaotic, clumsy preparations, it's a song packed with pure love and celebratory joy. Let's all chant "Tan! Tan! Tan!" (Celebrate!) together and enjoy this happy birthday anthem!