1573, Nobunaga occupied Nijo Castle and exiled the then general Ashikaga Yoshiaki. Since then, he has ruled as a warlord, without calling himself a general or establishing another general. Because "the emperor is the ruler of the world", he actually exercises the authority of the shogun in his own control area. The reason why he doesn't call himself a general is probably close to the reason why Cao Cao doesn't call himself an emperor. One is for the sake of fame, and the other is that he has not unified Japan. Calling the general too early will make excuses for other powerful names. During this time, Nobutaka Oda has been preparing for the establishment of a new shogunate in the future, such as revising the genealogy (counting his ancestors under the name of Heiqingsheng).
1582, after Nobuyuki Oda's death, a series of wars broke out between his subordinates and governors, and finally Yuchai Hideyoshi completely accepted his mantle. However, Yukio Hatoyama has a major flaw: the issue of identity. According to Japanese medieval regulations, the shogun had to be born in Genji (or at least in Shi Ping), while Yuki Xiuji was born in a low-ranking peasant ... He gained Japanese sovereignty so quickly that he didn't have time to create his own "genealogy".
So he can only find a noble family from Genji and forcibly become the adopted son of a noble family. However, the only well-known Genji family at that time was Ashikaga (a branch of Genji), and Ashikaga refused to accept Hideyoshi as an adopted son, so Yuchai Hideyoshi was never qualified to be a foreign military general.
In order to avoid Hideyoshi becoming angry from embarrassment, Fujiwara, who was born as Regent Guan Bai (equivalent to China's prime minister and first civil servant), made a concession, took Hideyoshi as his adopted son, became Regent Guan Bai, and ruled Japan as Fujiwara's supervisor. Hideyoshi was dissatisfied with his adopted son's status, and coerced the court to agree to establish the "Chen Feng family", taking the Chen Feng family as the family to inherit Regent Guan Bai.
At this time, Japan was nominally ruled by "ministers" (in essence, by samurai), so this system was called "social official system", which was different from the shogunate system. After Tokugawa Ieyasu became a general who conquered foreign countries and established the Edo shogunate, the system of seizing customs automatically disappeared.