Popular Japanese Online Fleet SLG game : Kantai Collection, Kancolle
Kancolle, stands for Kantai(Fleet) Collection. It is a SLG online browser game that Tsunogawa Games developed and administrates. The player becomes an admiral and collects the Kanmusu (Japanese Naval vessels that were used during World War II are personified by female anime characters.) The player needs to strengthen their fleet in order to fight against the numerous enemies from around the world. If you lose one of your Kanmusu characters, you can not regain her again. So, the players tend to take the game more seriously.
More than 1.5 million people already registered to play this game and the number is still growing. Unfortunately, this game is only available in Japan. (You need a Japanese IP address to access the game.) One of the reasons this game has grown in popularity is because it has combined the concept of a cute girl and military weapons. All Kanmusu characters are voice-acted by famous voice actors.
Kancolle is basically a free game to play. However, you can pay to add a dock, change interior of control room and add other modifications.
Kancolle Game play 艦隊これくしょん～艦これ～
MMD Kancolle (MikuMikuDance Kankore)
>> Kancolle site DMM.com (Fleet korekushon not available in oversea.)