Higashimura was born in 1975 in
Kushima in
Miyazaki Prefecture. During her childhood, she moved frequently due to her father's job, relocating five times during elementary school and twice during junior high. From a young age, she enjoyed drawing and was supported by her parents in her artistic interests. Influenced broadly by
shōjo manga of the 1980s, she aspired to become a manga artist from early on, though she did not pursue this dream professionally until adulthood. She debuted as a professional manga artist in the now-defunct
manga magazine Bouquet Deluxe in 1999 with the short story . Her first serialized work was
Kisekae Yuka-chan (2001), published in the shōjo magazine
Cookie. The series centered around a fashion-loving sixth-grade girl, a choice Higashimura made due to her initial discomfort with writing romance, despite it being a hallmark of the shōjo genre. One of her breakout hits was
Mama wa Tenparist, an autobiographical child-rearing manga that began in 2007 in the
josei magazine
Chorus. The series documents her life with her toddler son and became an unexpected hit, selling over one million copies. In 2006, she began serializing
Himawari: Kenichi Legend in the
seinen magazine
Morning, marking her foray into male-targeted publications and launching a dual-career track in both
shōjo/
josei and seinen magazines. == Style and themes ==