The main character, Kazuki Tomonaga, is a robot and has no emotions. The purpose is to learn that of human beings through experience and learning, and the process is an important essence of the scenario.
The average play time of one lap reaches 30 hours or more, which is the longest among Nitroplus works, and it is far behind " Demonbane ". This hasn't been broken yet. A wealth of resources such as the number of backgrounds and objects drawn in 3D are also invested.
This is the first work in which Gen Urobuchi is not very involved in the production (I have come up with the idea of making the main character a robot).
Source: Wikipedia, "[ja.wikipedia.org/wiki/%22Hello%2C_world.%22 "Hello, world."]", available under the CC-BY-SA License.