CORE is MERRY's official fan club, which offers privileges for an annual fee. Joining CORE requires an address in Japan. Some shopping services specialize in fan club memberships.
The list of CORE member privileges, as advertised on the CORE login/about page, is as follows:
- The MERRY news magazine, "CORE MAGAZINE", mailed out four times a year. Includes pages for each member and exclusive interviews. (Japanese)
- CORE special membership card. Comes with a cardholder and lanyard.
- CORE original live tickets. Advance reservations for CORE members.
- Access to MERRY's online shop, full of items that only CORE members can purchase.
- Access to CORE members' only website. Includes:
- Information: Get the latest news first.
- CORE Log: Blog entries written by the members.
- Gallery: Live cut and candid photos.
- Download: Original desktop wallpapers.
- Shop: Purchase CORE-only goods.
- Participation in CORE lives and events.
- Receipt of CORE members-only e-mail magazines. (Irregular schedule.)
The membership fee for CORE is a one-time admission fee of ¥1,000 + an annual fee of ¥5,000, i.e., ¥6,000 when you first join.