幕末志士

A duo who uploads let's plays and such to Niconico; they also make games. Main members are Ryouma Sakamoto (real name Akira Kirizaki) and Takamori Saigo (real name unknown, alias Sosshii), but they do have support members who help with both videos and games. 
Both of them don't have set roles when it comes to game making, and what/how much each of them do depends on the game.