Ganbare! Memeko-chan

Memeko worked hard at vocational school in order to fulfill her dream of becoming an office lady. However, when she gets hired, she finds herself isolated in a department with only one co-worker! While the company president always praises her work, she'll have to keep working hard in order to get the friends and office social life that she really wants.

(Source: MangaDex)

Included one-shots:
Volume 3: Real na Ganbare! Memeko-chan (art: Kon Junko)
Volume 4: Oide yo Mimiko-chan