Notes about quarterly installment charges & discounts for men who pay by credit card:
Silver members are charged the full membership price in one charge.  This charge covers registration & 3 months of mailings.  The total charge for the Silver Membership is ¥36,000.  (¥28,800 if you have a 20% discount.)
Gold members without a discount are charged ¥36,000 for registration & 3 months of mailings.  Then, 3 months later, Gold members are charged ¥18,000 for 3 more months of mailings.  The total charge for the Gold Membership is ¥54,000.  (¥36,000 + ¥18,000 = ¥54,000)
Gold members with a 20% discount are charged ¥36,000 for registration & 3 months of mailings.  Then, 3 months later, Gold members are charged ¥7,200 for 3 more months of mailings.  The total charge for the Gold Membership is ¥43,200 if you get a 20% discount.  (¥36,000 + ¥7,200 = ¥43,200)
Diamond members without a discount are charged ¥36,000 for registration & 3 months of mailings.  After 3 months, they are charged ¥12,000 three more times, once every 3 months.  The total charge for the Diamond Membership is ¥72,000.  (¥36,000 + ¥12,000 + ¥12,000 + ¥12,000 = ¥72,000)
Diamond members with a 20% discount are charged ¥36,000 for registration & 3 months of mailings.  After 3 months, they are charged ¥7,200 three more times, once every 3 months.  The total charge for the Diamond Membership is ¥57,600 if you get a 20% discount.  (¥36,000  + ¥7,200 + ¥7,200 + ¥7,200 = ¥57,600)
If you have a coupon for a different discount you'll be charged in installments in a similar way.  Inquire to tma-cr@xui.biglobe.ne.jp for exact details.