Setsuna finds himself caught between his impossible love for his younger sister and having to suffer the fate of being the reincarnation of the organic angel Alexiel. Rochel, the inorganic angel (and Alexiel's twin brother), will suddenly appear. He will pursue Setsuna and his sister with determination, using the famous video game "Angel Sanctuary", which has already claimed several victims. We will also discover that the only person who was, until now, listening to Setsuna hides, in fact, a terrible secret...
