雷子 - 紺碧の章 -

Set in ancient China about 600 years before the Three Kingdoms era, in "Kashiwaetsu" located in the south of the Chinese continent in the era called "Spring-Autumn Warring States Period". A young man decides to take opportunity to gain power by assassinating the previous king and putting his friend in his place, only to find he and the new king following a dark path of chaos and cruelty...