In 1975, Umezu started becoming a public figure also apart from creating manga. He recorded songs based on his horror manga and released them as the solo album Yami no Album.
Umezu's manga broke with the norms of the commercial manga industry at the time that he started publishing in major magazines in the mid 1960s and created a boom around horror manga in the late 1960s. Tsuchiya Dollase writes: "The monstrous mothers must certainly have scared the audience; at the same time, however, the torture of the pretty but superficial heroines by these horrifying mothers must have given the same audience a certain pleasure."
Umezu regularly received complaint letters from parents in the beginning of his career due to his horror visuals and also editors of magazines would ask him to scale down the violence in his imagery. He remarks in an interview: "I was protested but never boycotted. I considered such criticism to be a form of praise." He was critical of watering down horror elements: "Old Japanese folk stories and fairy tales could be unflinchingly brutal. They come from a time when tragedy and carnage was an everyday part of life. Now we have people calling to water them down, which essentially whitewashes history. It’s insulting to the memory of those who suffered to bring us these stories."
Besides his impact on the development of horror manga, scholar Tomoko Yamada counts Umezu as one of the shōjo manga artists in the 1950s who contributed to the development of ballet manga with his series Haha Yobu Koe (1958) and Maboroshi Shōjo (1959).
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