The current emperor of the Beiliang Dynasty has been on the throne for three years. The internal and external crises that plagued him when he first ascended the throne have largely been resolved, and now that things have settled down a little, the emperor decides to tackle the long-standing problems in the southern lands.
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Before setting off, the emperor summons the eldest princess to the palace, then quietly departs in the dead of night...
The eldest princess the next day: Imperial Sister, aaaaaah!
In short, it's about an abnormal eldest princess in a world where no one is quite normal.
Theme: I told you, Imperial Sister is number one under heaven!
