Aliasing chu_chu_idol -> chu_x_chu_idol.
Reason: There's one of those multiplication symbols the Japanese are so fond of in the title: Chu×Chuアイドる
http://www.softpal.co.jp/unisonshift/products/project15/project15.htm
And that seems to be represented by "x" in our tags: hunter_x_hunter, namco_x_capcom, kiss_x_sis
Updated by jxh2154