Soul Hunter, is a Japanese manga series by Ryu Fujisaki. Hoshin Engi is inspired by the Chinese literary classic Investiture of the Gods, a shenmo novel. The story involves the Chinese mythology and history of China, in particular the last members of the In (Yin Dynasty aka Shang Dynasty) and the plot to overthrow them.
The 26-episode anime storyline somewhat follows the main plot of the manga, with the young (72-year-old) "doushi" (Apprentice to a Sennin) Taikoubou told to go from the Sennin (Immortal) world to Earth (and specifically Yin China) to hunt down 365 renegade evil spirits in order to bring down the fall of Queen Dakki, a Fox spirit who has enslaved the Emperor.
Taikoubou recruits Nataku, a human/weapon hybrid, and Raishinshi, a would-be vigilante, in his quest to hunt down Dakki. He is later joined by Youzen, the Tensai (Genius) Doushi of Kunlun and Kou Tenka, the son of the duke Kou Hiko. He also rides a talking 'hippopotamus' (actually a Reijuu) named Suppushan, who remains the most popular character of the series.
Ki Shou, the Lord of the West, is a man who is unwittingly destined to found the Zhou dynasty. Imprisoned for trying to stop Dakki's evil, he suffers a grievous guilt when his son is murdered and served to him as a meal, causing him to refrain from eating. Escaping from his captors, he returns with an army to overthrow the Yin with the help of Taikoubou.
In the midst of this historical drama, the Immortal High Council (a group of three Immortals seemingly of a higher position than Genshi-tenson) is plotting some form of magical spell that requires the capturing of many souls, which made them deliberately lie about the purpose of the Houshin Project to Taikoubou.
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