On the noisy campus of Mingde Middle School, newly admitted junior high school student Sakuya Hoshimi has become the focus of attention with his childish-haired face and indistinguishable androgynous appearance. He is also regarded as an alien because of the mysterious tarot cards circulating between his fingers. Sakuya's "divination" is not a child's play card game, but a real ability to discern fragments of fate with a heavy price. Day after day, he hid in the dim candlelight of the old study, immersed in the ancient world constructed by esoteric classics, accompanied by a pair of tarot cards that could draw a purple halo, until he accurately foresaw the danger that his deskmate Lin Xi was about to encounter - the girl who was as pure as sunlight shining into his lonely world.
The gears of destiny were set in motion as this prophecy came true. A strange "black book" with a blank cover arrives inexplicably, like a dark key cast by fate, which instantly disturbs Sakuya's spiritual world and attracts a coveted person named "Shadow Tarot Society" (STS) - an ancient organization that believes in corrupt destiny and attempts to collect seven forbidden books to guide the apocalyptic catastrophe. The peaceful campus suddenly became undercurrents: malicious slander by rumors, greedy exploration of mysterious powers, warnings of violent break-ins in the study, fatal invitations from lurking apostles... The crises that followed one after another tore open the surface of daily life.
In the face of danger, the sunny and cheerful Lin tide showed extraordinary persistence and courage. Her trust became Sakuye's beacon against the erosion of darkness, and her clear heart was like a solid "anchor", calling him back time and time again when Sakuye was on the verge of losing control due to touching the power of the forbidden black book.
