Alexiel, an angel who held a deep love for God, defied Heaven after witnessing the shameful conduct of her fellow angels. As a consequence of her actions, she was apprehended and exiled to live multiple tragic lives on Earth. Presently, she resides within the form of a troubled youth named Setsuna Mudo, who harbors romantic feelings for his sister Sara. Setsuna's agony echoes the turbulence amongst the angels, and their intense emotions carry the potential to devastate both Heaven and Earth.