Debut single of the SNS, Z generation influencer artist The title song"Heroine of the Day 365" is a heartwarming that sang a feeling of gratitude to the mother who always raised them Message song. In addition, the"101th Challenge" of the coupling is adopted as the opening theme of Asahi Broadcasting's "# Club Activ ONE! Broadcasting Club"and is a theme park girl style cheering song directed at all those who try hard. It is two songs that can feel the emotions of life-size girls who are transmitted in real because all teenage members sing.