The story takes place in a fictional world called "Garden". The mysterious power enables some humans to gain special abilities. The "Holy War Angels" are a race that has long been lost in legend. They can transform into super weapons and fight through cooperation with humans. Now, this race has gradually begun to recover. Ku (voiced by Akira Ishida) is an ordinary and kind boy. One day, he met a mysterious girl named Lei (voiced by Mikako Takahashi). It turned out that Lei was one of the "Holy War Angels". She asked Ku to take her back to the holy land "Edilu Garden". In this way, Ku and Lei, who were blamed, embarked on a journey. The cheerful, lively and lovely Siska (voiced by Nana Mizuki), the gentle Longwei (voiced by Yuji Ueda), and the mature and gentle Chia (voiced by Nahoko Suzuki), the three came from the Complete Protection Society that specializes in protecting the Holy War Angels, and they also joined Ku and Lei's team.