In River City Saga: Three Kingdoms, the characters of the Kunio-kun series run-amok in the world of Sangokushi. The game, which follows the flow of the popular Downtown Special Kunio-kun's Historical Period Drama!, sees players cross countries and challenge the Romance of the Three Kingdoms.

Set in the late Han Dynasty during the Warring States period where local warlords rivaled against each other, a nonsensical and exhilarating comedy adventure will unfold with Guan Yu (Kunio) as the protagonist living in the turbulent age. Additionally, familiar characters will also appear as warlords and tacticians, dyeing the world of Sangokushi in Kunio-kun. Experience the start of the turbulent age that is the “Yellow Turban Rebellion,” the famous “Battle of Red Cliffs,” and more in the style of comical action.