In 2012, Dentsu Inter Admark Media Group was launched in Indonesia to release and manage JKT48, one of the many sister groups of AKB48 outside Japan.
The AKB48 sister group JKT48 announced the release of "Manatsu no Sounds Good! - Musim Panas Sounds Good!", an Indonesian version of "Manatsu no Sounds Good!", as its fourth single for November 26, 2013.
In 2013, Momsen appeared in a television commercial for Samantha Vega handbags along with one of the Japanese idol Tomomi Itano of AKB48.
Joining those 26 members are AKB48's Sae Miyazawa and Mariya Suzuki, who are currently taking part in AKB48's overseas temporary transfer program.
The first CD (CD1) includes seven of AKB48's singles that were released in 2012-2013, from "Manatsu no Sounds Good!" to "Koi Suru Fortune Cookie".
He is also working on debuting an Indonesian version of AKB48 called JKT48.