Merukura

Mail Club (メルクラ) are mobile phone and personal computer based dating services originating in Japan. The term comes from the contracted form of the Japanese mail club (メール クラブ).

Mail Club System
Emails are exchanged between members through a central server, ensuring email addresses remain private. Mail Clubs are used in various ways, the most common being for dating, friend searching, or to find sex partners. It is common that only the male has to pay to participate, with the cost of sending a mail ranging to up 400¥ per message.