Hades is planning to take over the world, to achieve that goal, he sends out deceased Gold Saints to take Athena's head. Seiya and the other Bronze Saints come to help but their help isn't appreciated by the remaining Gold Saints that are still alive. (Source: ANN)

For the appropriate price, your dearest wish can be granted at the shop of the peculiar Yuuko. Kimihiro Watanuki wishes to be rid of his ability to see spirits, and so as payment, he works for Yuuko doing whatever she needs him to do, from cleaning to errands to even helping out Yuuko's other clients. In xxxHOLiC Shunmuki, Watanuki and his friend and rival Shizuka Doumeki enjoy a meal with their friend Kohane Tsuyuri and her grandmother, reminiscing about how they have changed since meeting each other. Later on, Watanuki has a dream in which he is visited by Doumeki's grandfather Haruka, who needs him to find some things in the family temple storeroom. Accompanied by Doumeki, he finds that this task is more akin to a treasure hunt, with each item leading them to another, and another, guiding them to an unexpected yet inevitable ending. [Written by MAL Rewrite]

Dispersed around the world, there are several bizarre labyrinths hiding incredible treasures within them. These mysterious places, known as "Dungeons," are said to be the work of Magi, a class of rare magicians, who also help people build their empires by guiding them to a dungeon. Djinns, supernatural beings that rule over the labyrinths, grant successful conquerors access to their immense power and choose them as potential king candidates to rule the world. Having spent life in isolation, Aladdin, a kind and young magician, is eager to explore the world upon finally leaving his home behind. He begins his journey only accompanied by his mentor Ugo—a djinn that Aladdin can summon with his flute. However, Aladdin soon becomes friends with the courageous Alibaba Saluja after causing the destruction of a local merchant's supply cart. In order to pay for the damages, Alibaba suggests that they attempt to conquer the nearest dungeon, taking the first step in an epic adventure that will decide the fate of the world itself. [Written by MAL Rewrite]

The movie is a compilation of episodes 1-8 of the 2017 television series with new scenes added for the introduction. It covers the period from when Riko descends into the Abyss with her robot companion Reg, reaching the second layer where they meet the White Whistle Ozen who reveals information about Riko's mother. (Source: Wikipedia)