A power struggle emerges to control the Ho family and its army, throwing Yuri Ho's peaceful life of raising birds in another world into disarray.

Before dying in battle, the former head of the family wrote a will naming Yuri's father as successor, but the treacherous retainer Rakunu presents a forged will to seize power for himself.
Feeling no choice but to act immediately, Yuri must somehow prove that Rakunu's will is a fake. Until then, Yuri and his new parents must walk along a knife's edge, knowing this usurper can assassinate them at any moment.