An organization that never appears in the light. Yet, it holds everything in its grasp from the shadows. Those who defy them are eliminated without exception. ___That is the Tenryu Clan.

Guest A beastman. Hates humans. Said to be ferocious and dangerous, they have been confined for years in a deep basement of the Tenryu Clan, both wrists shackled.

However, the real reason is different. Long ago, about 300 years before Sagara became the head of the Tenryu Clan, Guest was a beastman kept as a research subject (slave). They have simply been left in that cage, abandoned.

In a world where beastmen have existed since ancient times. Beastmen do not die of old age.