Kaiseizan Girls' High School

Kaiseizan Girls' High School (甲斐聖山女子高等学校) is a Garden in Koshu, Japan.

Though Koshu as a whole is considered a fallen region, Kaiseizan continues to operate as a Garden with support from Kamakura.

Prior to the fall of Koshu, Kaiseizan was considered the strongest Garden in the Koshu region. It particularly focuses on the cultivation of the Rare Skills Heliosphere and Testament, and has a special course of study for Testament users. The Garden is reportedly not knowledgeable about other Rare Skills due to this focus.

During the Koshu Evacuation, the student council president of Kaiseizan, Kurumatani Keine, pushed to have the Garden abandon its grounds and retreat to Kamakura. She was opposed by a faction lead by Yumeno Kanon, at the time in her third year of junior high school. Keine eventually lead about 30% of Kaiseizan's Lilies in a partial retreat, while the remaining Lilies stayed at Kaiseizan, determined to defend it even in the heart of occupied territory. Many of the former Kaiseizan students who fled to Kamakura, including Keine, enrolled in Yurigaoka.