The Nikkan Sports newspaper reported on Friday that former NGT48 theater manager Etsurō Imamura has been appointed as board member in the AKS main office in Tokyo.
AKS is the management company of AKB48 and its sister groups, including NGT48.
NGT48 is a sister group of the AKB48 idol group based in Niigata prefecture, and it launched in 2015.
The police said that the suspects “only wanted to talk to Yamaguchi, and didn’t think it would be a big deal.”