This is casual game that players fight against enemy characters of each Japanese prefecture by power of own family name.
Then, we choose own native prefecture. Each prefecture have characters associated with the area, but all of them are funny.
This game displays the number of the family names every each prefecture by ranking. In addition, the family names express regionality in Japan. For example, Okinawa(沖縄)'s general family name is rare in other prefectures, because originally Okinawa was an independent kingdom called Lewchew(Luchu or Loochoo: 琉球). The family names established for the kingdom era are used in current Okinawa. We can know the regionality of family names in this game. By the way, Akita that is my native prefecture was a place of banishment of nobles in the Heian era(平安時代), and escape of loser warriors in the Sengoku era(戦国時代). So there are many family names in conjunction with them. My ancestors were loser warrior, too, but the detailed data did not come out because unfortunately my family name "Komoriya(籠谷)" was too rare and was the minority.
This is an interesting inflection example of big data. If you learn in Japanese, in particular kanjis, this is a pleasant casual game. You will come across many Japanese strange family names here.