ASTELLA SAGA -アステーラ サーガ-

In the otherworld known as Astella, the World Tree absorbs all forms of energy and produces a universal power called mana.
Heaven secretly dispatches angels, who over many long years have been protecting and managing that World Tree.
However, one day, contact from the dispatched angels suddenly ceases.
To investigate the situation, one angel descends from Heaven to Astella…