NiziU is heading back to Korea to promote their latest Korean mini album, Sour Grapes. The move marks another step in the group's ongoing effort to build their presence in the Korean market alongside their Japanese fanbase.

NiziU, the JYP Entertainment girl group formed through the survival show Nizi Project, has steadily expanded their activities beyond Japan. They debuted in Japan in 2020 and have since released multiple Japanese albums and singles while also pursuing Korean releases. The group consists of nine members: Mako, Rio, Mayuka, Hina, Akari, Ayaka, Maya, Riku, and Niina.

The Sour Grapes promotion signals the group's strategy of maintaining dual-market momentum. Korean mini albums have become a key part of how Japanese acts, particularly those under international labels like JYP, reach audiences across East Asia. For NiziU, Korea represents both a substantial fanbase and a launchpad for broader regional visibility.

This promotional cycle also comes as NiziU navigates the competitive landscape of girl groups in both markets. Groups like INI and NEWS have shown that Japanese acts can succeed with dedicated Korean and international strategies, and NiziU appears committed to following that playbook.

Fans can expect promotional content including music show appearances, interviews, and behind-the-scenes footage as NiziU supports Sour Grapes in Korea. The group typically balances Korean and Japanese activities, so concurrent promotions in Japan are likely as well.