Tokiwa-so was a pre-war structure, one of the wooden buildings that survived the firebombing of Tokyo during World War II. It became part of the nucleus of the Minami Nagasaki residential area in Toshima ward. The building's transformation into a manga crucible began in 1953 when Osamu Tezuka, already famous as the creator of Astro Boy, took a room on the second floor. Tezuka lived there for only about a year, from 1953 to 1954, but when he moved out, he did something that changed the course of Japanese pop culture: he offered his room to the young writing duo Fujiko Fujio, who would later create Doraemon. The gesture established a tradition. As rooms opened up, residents passed them along to promising newcomers, creating a self-sustaining colony of manga talent. Hiroo Terada arrived in 1953. Shotaro Ishinomori, future creator of Kamen Rider, moved in by 1956. Fujio Akatsuka, who became famous for absurdist comedy manga, followed the same year.

Tokiwa-so was not just a residence; it was the prototype for how manga would be made. Tezuka pioneered a production system at the apartment in which a lead artist employed multiple assistants to help complete pages on deadline. The model was born of necessity -- weekly manga magazine schedules were relentless, and a single artist could not keep pace alone. The system took root in the close quarters of Tokiwa-so, where artists could knock on a neighbor's door and recruit help. This collaborative model, with several assistants supporting a main artist, became the standard for the entire Japanese manga industry and remains in use today. For young artists, working as an assistant at Tokiwa-so served as both apprenticeship and audition. The residents pushed each other, competed with each other, and built careers in parallel. Hideko Mizuno, one of the few women in the building, lived there in 1958. George Yamaguchi stayed from 1960 to 1962, part of the final generation before the building's purpose faded and it became ordinary housing again.

The original Tokiwa-so was demolished in 1982, and the site became the offices of Nihon Kajo Publishing. But the building's cultural significance only grew in the decades after it vanished. In April 2009, Toshima City erected a bronze monument in Minami-Nagasaki Hanasaki Koen public park, a short walk from where the original stood. The monument features self-portraits and autographs of ten former residents, topped with a small model of the building. The concept of Tokiwa-so as an incubator for young manga artists also spread beyond Tokyo. In 2013, Kyoto's Kamigyo ward converted a century-old row house into its own version for aspiring artists. In 2015, Niigata City announced Komachi House, a rent-free residence for up-and-coming female manga artists, with instructors from the Japan Animation and Manga College providing lessons in exchange for the artists working on city-led projects.

In July 2016, the Toshima ward government announced its most ambitious tribute: a full-scale replica of Tokiwa-so, to be built in Minami-Nagasaki Hanasaki Koen public park, just a three-minute walk from the original site. The replica would house a museum dedicated to manga and anime. Originally scheduled to open in March 2020, the project was delayed by the COVID-19 pandemic but officially opened on July 7, 2020. The replica recreates the original building meticulously, down to fake mold on the wooden surfaces -- a detail that speaks to how seriously the museum takes the authenticity of the Tokiwa-so experience. The cramped rooms, the sparse furnishings, the sense of creative possibility within physical constraint: the museum preserves all of it. Visitors can walk the same hallways where Tezuka sketched and Fujiko Fujio plotted, and understand how a building with no baths and cold-water sinks became the birthplace of an industry.