Onei Jinushi forms half of the central twin duo alongside her brother Junichirō Jinushi, residing in Tokyo's lower-class neighborhoods where they lead carefree urban lives. Their daily existence unfolds through navigating metropolitan streets while engaging in simple, joyful activities like holding hands, jumping, playing, and laughing as they traverse their community. These routine explorations bring them into contact with diverse local residents, sparking heartwarming neighborhood encounters. The twins' shared experiences focus on discovering their surroundings and learning from the people they meet, with their inseparable sibling bond driving the narrative through joint adventures and mutual reactions to their environment.