ADDRESS1 is a post-apocalyptic STG game that features a unique combat system that relies heavily on close-range attacks. The game is a vertical scroll shooter that takes place in a post-apocalyptic world where the player takes on the role of a female cyborg named Penryn. Penryn wields two large swords that she uses to fight against enemy bullets and aircraft. The game's story revolves around Penryn as she tries to regain her lost memories by venturing into the deepest part of the facility known as "Kinshirotori."

The game features a female cyborg character with silver hair, a green shirt jacket, and a navy blue skirt. The character's identity and backstory are shrouded in mystery, and she is either a robot or a human who has undergone extensive cyborg transformation. The game's combat system is unique and heavily relies on close-range attacks, making it stand out from other STG games. ADDRESS1 consists of five stages with a story that unfolds as the player progresses through each stage. The game also includes a "HOW TO PLAY" guide that explains the basic controls and a "PRACTICE ROOM" that allows players to freely practice their skills.