Qin Shi Mingyue: Tian Xing Jiu Ge
Genres: Action, Fantasy
Type: ONA, Episodes: 60
Aired: Mar 10, 2016 to Jul 5, 2018
Studio: Sparkly Key Animation Studio
Source: Original
Rating: PG-13 - Teens 13 or older
Synopsis:
Facing the threat of the Qin State, danger seems to lurk within the Han State, which is known as the weakest out of the Seven States. Unknown to the Han Emperor, that very threat is the Great General of Han, Ji Wuye. Working under the Great General are the Four Fearful Warriors of Nightfall.

Each four specialized in military, finance, politics, and espionage. In hopes of creating a new Han State, Quicksand was formed by Han Fei, the ninth prince of the Han. With Wei Zhuang, Zhang Liang, Zinü, and Nong Yu, they support the Prince in realizing the goal of Quicksand while being drawn into a whirlpool of power named “world”.

(Source: wikipedia)