COMG!

COMG! is a popular Japanese retailer, with a really handy website that gets updated daily with the number of preorders recieved for the top 20 most preordered videogames. COMG! is used by VGChartz users as an indicator of how much interest a certain title generates in the japanese territory. COMG! points don't have any specific proportion related to the actual sales of the games, but a rough rule of thumb is that one point equals 1000 sales in the games first week.