"100%" is a manga series that explores themes of ambition, relationships, and self-discovery within the competitive world of music. The story centers around two main characters, Kenzou Tenma and Rina Izumi, whose lives intertwine through their shared passion for music. Kenzou is a talented but aimless guitarist who struggles to find direction in life, while Rina is a driven and ambitious singer determined to achieve stardom. Their paths cross when Rina recruits Kenzou to join her band, setting the stage for a journey filled with personal growth, creative collaboration, and emotional challenges.

The narrative delves into the dynamics of the band as they navigate the music industry, facing obstacles such as rivalries, creative differences, and the pressures of fame. Kenzou’s journey is particularly central, as he grapples with his insecurities and gradually learns to channel his talent into meaningful expression. Rina, on the other hand, is portrayed as a complex character whose relentless pursuit of success often clashes with her personal relationships, including her evolving connection with Kenzou.

Supporting characters, such as the band’s other members and industry figures, add depth to the story, highlighting the collaborative and often tumultuous nature of artistic endeavors. The series also explores themes of identity and authenticity, as the characters confront the tension between commercial success and artistic integrity. Through its focus on music as both a personal and shared experience, "100%" offers a nuanced portrayal of the challenges and rewards of pursuing one’s dreams in a competitive and ever-changing world.