Seikai Suru Kado

During a routine return flight from a work assignment, diplomat Shindou Koujirou observes an enormous geometric structure materializing mid-air, engulfing the aircraft and everyone aboard. Within the enigmatic structure, he encounters a humanoid entity identifying itself as Yahakui Zashunina. This being originates from a dimension referred to as the “anisotropic” realm and expresses intentions to “progress human civilization.” The sudden appearance of this otherworldly cube and its inhabitant thrusts Shindou into an extraordinary situation beyond conventional understanding. As the sole representative of humanity within this strange environment, he must navigate interactions with this advanced being while uncovering the true meaning behind its cryptic statements. The unfolding events suggest profound implications for Earth’s future as Zashunina begins demonstrating capabilities that defy known physical laws. This encounter between two civilizations—one familiar, one utterly alien—sets the stage for a confrontation that could reshape humanity’s destiny. The mysterious visitor’s true motives remain unclear, leaving Shindou to determine whether this represents an opportunity for mankind’s evolution or a potential threat to its existence.