Overall, Aigis is the #3 most popular game on Nutaku in the past three months. It slipped briefly in February to #4 due to a surge in popularity in Dragon Providence, despite its own numbers rising. You can confirm that by reading about it on the blog post we wrote last month. (
http://www.nutaku.net/blog/year-in-review/ )
The "most popular" chart appearing on the homepage is currently based on the metric of most new registered users trying the game out for the first time. The actual title should be titled "Most New Players" and will probably be updated in the near future.
Aigis is a great game with a strong community. We have a lot of ambitious plans for reversing the somewhat inconsistent level of JP developer attention, and when we implement that plan, you can expect a major announcement both here and on our social pages.
Thanks.