The Conqueror from a Dying Kingdom (Manga)

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.