Anne leaves Green Gables and her work as a teacher in Avonlea to continue her education at Redmond College in Nova Scotia. She tucks her memories of rural Avonlea away and discovers life on her own terms, filled with surprises…including a marriage proposal from the worst fellow imaginable, the sale of her very first story, and a tragedy that teaches her a painful lesson.
(Source: Barcarolle)

This is based on the book Anne of Avonlea and it's a sequel to Anne of Green Gables. It follows Anne from the age of 16 to 18, during the two years that she teaches at Avonlea school. Anne discovers the delights and troubles of being a teacher, takes part in the raising of the twins Davy and Dora and organizes the A.V.I.S. (Avonlea Village Improvement Society), which tries to bring improvements to Avonlea with questionable results.
(Source: MangaUpdates)

Miss Marilla Cuthbert and Mr. Matthew Cuthbert, middle-aged siblings who live together at Green Gables, a farm in Avonlea, on Prince Edward Island, decide to adopt an orphan boy from the asylum as a helper on their farm. Through a series of mishaps, what ends up under their roof is a precocious girl of eleven named Anne Shirley. Anne is bright and quick, eager to please but dissatisfied with her name, her pale countenance dotted with freckles, and with her long braids of red hair. Being a child of imagination, however, Anne takes much joy in life, and adapts quickly, thriving in the environment of Prince Edward Island.
(Source: Stage Storm)