The school was founded in 1960 by Catholic mission under Rev. Fr. Joseph Oucho as a girls only day primary and intermediate school.

Due to the fact that girls were viewed as source of wealth and married off early, Father Oucho changed the school to a boarding institution in 1965 and served as the headteacher until 1970.

With increasing student population, St. Charles Lwanga, Ichuni Day Secondary, changed to boarding school two years before it was taken over by government In 1973.

In 1980, the second stream was registered and the school started offering A-Level in 1988. The third stream came in force from 2002 with the fourth and fifth registered in 2007 and 2010 respectively.

The school had two blocks, one serving as dormitories while the other was the dining hall with the administration unit placed at the mission centre until 2009 when a new block was built. The current principal is Mrs. Mary Lucy Obondo.

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Notable alumni, who put on orange skirts and ties with white blouses include Mrs Joyce Orioki Ogutu, Principal Nyabururu girls and immediate former Principal at the school. Others include Jacklyne Mikuro, the Principal Marani Secondary and Conceptor Ombachi, who heads Kiareni Girls. 

Others who enjoyed rice served with beef stew on Fridays before retiring to St. Teresa, St. Valeria dormitories are Catherine Onsumu, the treasurer at Ichuni Parish, Mrs. Mecha, Ministry of Culture, Kisii county, Peris Isaboke, the Kisii County Secretary, Rachel Otundo, a land valuer, Mercy  Chemutai, a proficient cross country runner, Liesbeth Francis, an audit associate at the Deloitte E. Africa and Jane Kerama, a personal assistant to Managing Director, University of Nairobi.

Stella Achoki, the community development officer at the centre for community and development, Gladys Nyaboke, the branch manager, Premier Kenya, Everlyne Moriasi, the head of department Mathematics at Amabukose Secondary, and Nancy Ogeto, a financial controller at Logan Stevens Construction also recited the school motto, "Aspire to Excel."

Then there is Alice Batutu, the quality control clerk at Accer Global Logistics, Dorcas Moraa, a clerical officer with DALC Education and Dorcas Ongaga, a valuer at National Lands Commission .

Whenever girls were found sharing beds, the punishment was to repair beds.