What makes Sotsugyō by Zone notable?

'Sotsugyō' not only topped the Oricon charts but also resonated with a generation facing graduation and transition, becoming an anthem for farewell ceremonies. Its success solidified Zone's place in the J-pop landscape, showcasing the emotional depth that characterized their music during this period. Released on February 4, 2004, 'Sotsugyō' marked Zone's third single, following their breakout hit 'Secret Base (Kimi ga Kureta Mono)'. At this point in their career, Zone was consolidating their popularity in the J-pop scene after a series of successful releases, transitioning from a youthful image to addressing more mature themes.