Hakunogawa has had a fondness for drawing and doodling since she was a small child. At around age twenty-one, she began taking art more seriously, using A6- sized paper and ballpoint pens. She used to have a job, and would spend her breaks working on her art, but now she spends her days at daycare due to her mental health, where she can be seen creating all day. Whenever the artist has a free moment in a café, on the train or bus, she sketches impressions constantly and spontaneously. She has a preference for places with lots of people, and she will often use cups and drinks she sees as a motif, giving these things anthropomorphic qualities and projecting her thoughts and feelings onto them.
Hakunogawa works mainly in black and white because she has little money, and colour enters her pictures when she can afford it. In 2019, a Japanese film crew documented the room where she lives which is covered wall-to-wall with her drawings. She had her work exhibited at the Halle Saint Pierre, Paris, in 2018 in Art Brut Japonias II.