Supernatural, School Life, Horror, Yuri, Adult, Mature

One of Morinaga's earlier and darker works, Mare is a mysterious girl who has the power to summon monsters. Mare comes to a high school looking for individuals with relationships full of envy, hate, anger, and desire, searching for unjust acts and dishing out her own brand of justice. What is her purpose, and what challenges await her? And what awaits the students here with her arrival?