The height is more than 20 centimeters different from Ji Hiiragi Yukina. In principle, it's a demon.,Incomplete vampires.,In an event half a year ago, I inherited the power of the fourth true ancestor of the previous generation, "Flame of the Night". Seemingly indistinguishable from ordinary humans in appearance and appearance, he possesses the basic abilities of being a vampire, the curse of immortality of the True Ancestor, and the vast magic power that surpasses the dragon veins of the earth, and has nine of the twelve beasts of the Fourth True Ancestor in his body.

The actions of the current Fourth True Ancestor, Xiao Jiebing, are monitored by organizations around the world, and the only non-monitors who know the identity of the Fourth True Ancestor under the principle of surveillance are Nangong Nayue, Asterutti, Haze Natsune, and Eguchi Yutomi, as well as Blue Feather and shallot. Gucheng and Ashalion's classmates, Tsukishima Lun also knows that Usui Ice is not human, but he doesn't know that he is the fourth true ancestor.

People are very lazy.,Don't work hard for anything special.,It's not very lucky.,The only exception is that it's a very doting sister Nagisa.,Will pay everything for Nagisa.。 Studied in the senior department of the private Caihai School Park in Xianshen Island for one year Group B, and the attendance number is No. 1. In high school, my grades have basically reached the point where I can repeat a grade at any time, mainly because of the serious lack of attendance days, frequent tardiness and absence, and various problems caused by the constitution of vampires.

Contrary to the lazy character, the ability to act, judge, observe and analyze is quite good, the mind is very flexible, and it is rare to fall into a state of panic because of unexpected things, but also because it can remain calm and rational about no matter how big it is, and people are always felt to be free of tension and unconscious. Self-care skills are also very good, and when acting, they will consider the gains and losses before acting, and they will help those who need help around them. They are wary of strangers around them, but they are relatively trusting of people with whom they have good relationships and let their guard down. Yuma Sentogi, who was once a childhood friend, said, "I didn't know anything about the situation of the incident from the past, but it would appear at the most important moment."

Because of the problem of the Fourth True Ancestor and the identity of the unregistered demon clan, he needs to hide his identity from the outside world to avoid unnecessary trouble, and normally will only use his magic power and beasts to solve the problem when no one is around, that month is present, his life is in danger, or there is no other means available. The identity itself is well hidden, but in most of the events, the identity is detected by the presence of Xuexia Wolf and Yukina.

He used to be a member of the school basketball team, and he was selected as a seeded player when he was able to dominate the whole game in an official game with a single ability. The power of the Blood Servant has been lurking in Usuki's body since the events of four years ago, and Oseki has observed that Usuki's physical ability on the court, such as jumping power, reaction speed, and shooting accuracy, all have signs of surpassing humans. Because of an accident in a game that led to the loss of the game, Usui Bing saw that because of his own conceit to take away the enthusiasm of the members of the club, he also lost his enthusiasm, and took this opportunity to leave the club and give up playing basketball.

Half a year before the beginning of this story, in the "Feast of Flames", holding the Demon Breaking Spear (Crossbow) used to kill the True Ancestor, Agulola met and fought with the original Fourth True Ancestor who possessed Nagisha, and after reclaiming Nagisa from the original hands, Agulola entrusted the power of the Fourth True Ancestor to Usui Ice, and Agulola chose to commit suicide in order to protect Usui and the world he was in. And the matter of Ui Bing's inheritance of the Fourth True Ancestor is within the expectations of the Lion King's organs.

Archaeological research in Xiaoya City, and his sister involved in the bloodshed of the remnants of the Black Death Emperor. He was shot dead in the incident, but he took this as an opportunity to come into contact with the twelfth beast of the Fourth True Ancestor, "The Ice of the Enchantress", Agulola Florestina, and used his mortal body to devour the "Blood Memory" of the Fourth True Ancestor, who was supposed to devour the soul of the ancient city, and stretched his hand to ask Aguro for strength, and was accepted by Agulola and awarded a pair of ribs, becoming Agurola's "Blood Servant". In the same incident, Agulola awoke from the seal for the same reason, and the equally awakened Root (the cursed soul of the original Fourth True Ancestor) escaped from the seal and possessed Nagisha. Entrusted by Dimitole Vatra of the War King Realm to track down the remnants of the Black Death Emperor's faction, Nangong Nayue was one step late and brought the three of them to Xianshen Island after the incident.

In the three years that Usui Ice, Nagisa and Agulola were brought to String God Island by Nangong Nayue, Usui Ice has been living with ordinary people, Nagisa is extremely weak due to the power of the Fourth True Ancestor, and Agurola remains in a state of deep sleep. In order to free Nagisa from the fate of the Fourth True Ancestor, Usui's parents have been searching for a way. It wasn't until Liana Karjana's sister, Viltiana Karjana, woke Agulola from her slumber that Usui and Agulola met again. Because Agulola awoke from her slumber, the power of the ancient city as a vampire servant was re-supplied.

During the time that Usui and Agulola lived together, they encountered the ninth beast, "Two-Horned Scarlet". On the day of the "Feast of Flames", half a year ago, the original Fourth True Ancestor (Primordial) collected the power needed to complete the Fourth True Ancestor with Nagisa as the center, and recovered some of the dependent beasts. Ukuroshi and Agurola fought against the Primordial in the Feast of Flames, and with the help of the ninth "Deep Scarlet of the Two Horns", the third "Mercury of the Dragon Serpent", the fourth "Silver Mist of the Carapace", and the fifth "Lion's Gold", Agulola managed to separate the power of the Primordial Soul and the Fourth True Ancestor from Nagisha's body. In order to completely end the life of the original Fourth True Ancestor, Agulola entrusted the power of the Fourth True Ancestor and her sisters (Dependent Beasts) to Ubi Bing, and manipulated Usui Bing's body with the blood curse that the servants could not disobey, and shot the Demon Breaking Holy Spear made to destroy the True Ancestor into her heart and died with the original soul, and since then Ui Bing has become the newborn Fourth True Ancestor. (Markne)