Since you specifically mentioned "top," this likely refers to the feature included in the game's update (v112):
Idol JK Chikan Akushukai's V112 RJ01312785 Top represents a significant milestone in the group's career. With its infectious melody, stylish music video, and charismatic performances, this single has cemented the group's position as one of the most exciting new idol groups in Japan. As the group continues to evolve and grow, it's clear that they'll remain a major force in the Japanese pop music scene for years to come. idol jk chikan akushukai v112 rj01312785 top