The rock band 4xxERRORCODE is a six-member group from Akita, featuring both male and female members. Known for their “loud rock” style, they blend powerful vocals with heavy guitar riffs, creating a distinct sound that sets them apart in the indie music scene. Vocalist Yui is celebrated for her dynamic range and impactful low tones, while members like Kobb add intensity with death growls and shouts, giving their performances an intense and energetic vibe.