ナイトメア・アーサー　～Honest and bravely knight,Unleash from the night～ (Associated Names)

『Customs, traditions, lineage, social status. Matters that are beyond human control, that is what humans call fate.』 Magic and many different species exist in the world of Inglens. In this world, when humans turn twelve years old, they undergo a ritual to summon a familiar called a Nightmare. A Nightmare is a friend, and a…