Kaizoku was wandering around, looking for the shop he wanted. After finding it, he bought the revolver he desired. Kaizoku is a 19th years old who loves cowboy fiction, and he collects almost every firearm with a cowboy theme. Not just guns, he also buys costumes and hats. After purchasing the revolver he wanted, Kaizoku walked back to his apartment. As he opened the front door, Kaizoku suddenly fell—the floor had turned into a pit leading to an unknown place.