Can anyone explain to me the meaning of the comic "Angel Sanctuary"? It feels so profound and I don't quite understand it.

To be honest, it’s really hard to say. Yuki's comic style is like this. To put it simply, it is the story of the human world, the angel world and the demon world. The story begins with a boy named Setsuna.

The story begins when the body of the organic angel Alexiel sealed in the hollow corridor is stolen. Jiurei, the princess of the evil ghost clan, and her cousin Ziluo Jiuyin, in order to resurrect Alexiel, went to the human world to find the person who entrusted Alexiel's soul, and then met the protagonist of this story, Modo Setsuna. At that time, Setsuna was trapped in a contradictory and bitter love with her sister Mudo Sara, and had no time to care about him. At the same time, Kenda, the angel of wisdom who sneaked into the human world, implemented the "Angel Sanctuary" plan to rescue the sealed former Seraph Archangel and Commander-in-Chief of the Angel Army, the Mad Angel Inorganic Angel Luo Jie Aier, and opened the door to the human world, heaven and demon world. The great events of the new era are about to happen. However, Setsuna knew nothing about and cared nothing about being Alexiel's soul holder, but the cruelty of fate forced him to face this fact. First, his most trusted senior, Sakuya Kira, was killed in front of him, and then he discovered the truth that Kira-senpai was not a human being, and then his most precious sister died unexpectedly. Setsuna awakens with sorrow and anger, and the world collapses. The celestial saint Adam Gadamon used time magic to return the time of the material world to the moment before the collapse, and told Setsuna how to save Lelo. So Setsuna risked the separation of body and soul and set out to the Xingyou Realm to find Sara's soul. In the Star Nether Realm, the one who led Setsuna was actually Kato Yuri, who was killed by him in the material world. Kato blames Setsuna for the murder, but they reach an understanding while traveling together and fighting side by side. While chasing a girl (doll) who looks exactly like Sara, Kato is controlled by a mask and attacks Setsuna. At the Gate of Hell, Setsuna used the awakened power of the Organic Angel to defeat the culprit of all this - the gatekeeper of Hell, the Corpse Angel Uriel. After helping Uriel get rid of the shackles of the mask, Setsuna learned that Sara's soul was taken away from the Star Realm by someone. With the help of the useless dragon, Setsuna successfully left the Xingyou Realm. Because the vampire Boyce mistakenly pulled out the sword of Adam Gadamon inserted in Setsuna's body, Setsuna's soul could not return to its original body and could only enter Alexiel's body that was kept in the cellar. In order to help Setsuna resurrect his original body, Uriel asked Kato to pretend to be a savior angel (the legendary capable savior angel is actually the organic angel Alexiel) and kill the fire angel Mikael's men. The hot-tempered Mikael rushed to the Star Realm to find Setsuna. As a good friend, the wind angel Raphael thought there was a trap and followed him. This move played into Uriel's plan. Because Raphael is the only healing angel with the ability to raise the dead. On the other hand, a mysterious visitor came to the cellar - Beria, the magician of hell. Beria used sweet words to persuade Jiu Lei to become the Demon King's bride, and in exchange gave her the soul-returning potion (of course it was fake). Jiurei, who was eager to save the moment, resolutely went to the devil's residence - the lowest level of hell (i.e. the womb) alone. Now, Setsuna, who hopes everyone will be happy, has to rush to save Jiurei again. When he saw the face of Demon King Lucifer, who looked exactly like Kira-senpai, he was surprised and confused. The leader of the "Soul of the World", the organization of the Supreme Heavenly Rebellion against the dictatorial ruler of the heavenly world, St. Wolf Dalda - Archangel Shafar informed Setsunasara's soul to be preserved in the heavenly realm. As a condition for helping him rescue Lelo, Shafar asked Setsuna to become the spiritual leader of the "Soul of the World". Although Setsuna has appeared in front of everyone as a savior angel, her sincere and youthful speech has been very popular. However, their plan to rescue Lelo has encountered an accident - Lelo has already escaped from St. Wolf Dalda. Escape from the White Hall. But Sarao returned to prison because she couldn't let go of the holy witch Xiaocao who worshiped her and pretended to be her substitute. In this failed rescue operation, a large number of "World Souls" were captured or killed, including the current leader Shafar. Setsuna assisted Shafar's angel intern Raj El to save Shafar, but only caught up with the last scene of Shafar's painful death. The grief-stricken Rajel decided to inherit Shafar's legacy and lead the "Soul of the World" to resist Saint Wolfdarda. The moment he returned to the divinity world, he was blinded by Luo Jie'er, who was bloodbathed in the pit, and had one of his wings torn off. Kira was killed by Luo Jie's son in order to protect Setsuna. Luo Jiel took away the body of her sister Alexil, and was sniped by the Fire Angel Mikael when she was chasing after her. In order to seize the elemental guardian power of the water angel Jibril, Saint Wolfdarda tried to judge Sara and wanted to kill her. Instead, she was exposed by the earth angel Uriel and the wind angel Raphael and stepped down. Because Sendarfon has no body, he hopes that Lelo, whom his twin brother Metatro loves, will give birth to him. Therefore, Lelo becomes insane due to the influence of Sendarfon's obsession. Luo Jie'er became the commander-in-chief of heaven again, and after defeating Sendalfon, the brother of Archangel Metatro, she relied on the power of the resurrected Demon King Lucifer to enter the Tower of God. Setsuna, Mikael, Uriel, Jiu Lei and Kenda who followed Luo Jie'er also entered later. There, Luo Jie'er, controlled by the God of Creation, killed Kenda, and then the power awakened and broke out. Adam Gadamon's spirit body appeared after defeating the God of Creation and threatened Setsuna with Lelo's life. Only then did Setsuna realize that the God of Creation he had just defeated was just a stand-in.

In order to save the world, Setsuna asked Luo Jie Er, who was driven mad by the God of Creation, to kill himself, let his soul return to Alexiel's body, tell Luo Jie Er the truth, and merge with Luo Jie Er. Setsuna inherited their powers, and Uriel, Mikael, and Nine Thunder successfully sealed the possessed Adam Gadamon, the God of Creation. Finally, the world returned to normal, and Setsuna and Sara both returned to the world.