The six members of a girl group called "Next You" work to build their fan base so they can become big enough to perform at the Budōkan. As they overcome each new challenge and learn from their mistakes, the girls continue to build their popularity, and at long last the coveted Budōkan performance is scheduled for their third anniversary as a group. But a major scandal ensues, and with the Budōkan event looming right before their eyes, two key members are forced to drop out. Twelve years later, the "Next You 15th Anniversary Reunion Concert" is held once again at the Budōkan.