零号协议AgreementZero is a 3D simulation game developed by WanDouGame for Windows. The game starts with the player character entering a virtual world, but due to a fault in the entry process, the player loses some of their memory. The only thing the player remembers is their task, which is to find and establish a close connection with an important girl in the virtual world.

As the player interacts with the girls, they gradually retrieve their lost memories and use various means to achieve their goals. The game offers a free map, allowing players to enter any room to interact with the girls. Players can provide companionship, assistance, or services to girls in their daily life to enhance their liking for the player. The ultimate goal is to break through layers of spiritual and physical barriers and form a strong connection with the girl to complete the final task.

Additionally, players can edit and change the appearance of the girls' clothing, and after unlocking the action, they can "recall" it at any time to view it. Overall, 零号协议AgreementZero is an engaging game with an interesting storyline and plenty of room for personalization.