NiziU Earns RIAJ Platinum Certification Ahead of Korean Comeback with ‘Sour Grapes

K-pop girl group NiziU has earned a Gold Disc Platinum certification from the Recording Industry Association of Japan for their second Japanese EP, ‘GOOD GIRL BUT NOT FOR YOU’, according to JYP Entertainment and Sony Music Labels Inc. The milestone arrives as the group prepares to release their first domestic mini-album, ‘Sour Grapes’, in South Korea on September 28, 2026.

Scaling the Japanese Charts: The RIAJ Platinum Benchmark

The Recording Industry Association of Japan officially designated NiziU’s second Japanese EP, Aju Press reporting confirms, with Platinum status on September 10. Released on April 1 of this year, the record cleared the threshold required for the certification. In the Japanese music market, the association awards Platinum status to albums that achieve cumulative shipments of 250,000 copies.

The certified EP is anchored by its lead single, ‘Too Bad’. The track expresses taking the initiative to shape the future.

The Domestic Comeback Architecture: ‘Sour Grapes’

On September 28, 2026, NiziU will officially drop their first domestic mini-album, titled ‘Sour Grapes’.

Photo: ajupress.com

The timeline for the comeback began long before the drop date. JYP Entertainment initiated a multi-phase rollout across their official social media channels. This digital pipeline included a cinematic prologue film, conceptual mood posters, and a detailed promotion scheduler designed to ramp up engagement. On the afternoon of September 10, the agency unveiled a digital cover art featuring a star design overlaid on a lush cluster of grapes, establishing the visual metadata for the new era.

NiziU Korean Release Chronology

• October 2023: Korean debut with the single ‘Press Play’.
• March 2025: Second Korean single release, ‘LOVE LINE’.
• September 28, 2026 (6:00 PM KST): First domestic mini-album release, ‘Sour Grapes’.

Market Strategy and Ecosystem Expansion

Fans awaiting the new material can expect the ‘Sour Grapes’ drop to hit major digital music platforms at 6 p.m. KST on September 28.