Puzzle & Dragons X(パズドラクロス)

The story takes place in a fantasy world consisting of humans, Dragonoids and Monsters. There is a relative harmony between the three races. There are also Drops, spherical objects that come out of the planet, which can power up the Monsters. Humans and Dragonoids can take on the role of Dragon Callers if they have the capability to see the Drops, wherein, they form bonds with monsters. Currently, the planet is facing Drop Impacts, occurrences where a large amount of Drops are suddenly generated in a single area (and can also spread), which affects the lands and makes the Monsters berserk. In fact, one of the main duties of Dragon Callers is to settle the Drop Impacts by stabilizing the Drop distribution. The plot follows Ace, son of King (a powerful Dragon Caller, who is missing right from the beginning of the series) and Rena, who aspires to becomes a Dragon Caller like his father. His journey starts when he starts seeing the Drops and finds an egg of a Tamadra, an almost extinct species and he moves to Dragoza, a region formerly belonging to only Dragonoids, but currently occupied by many Dragon Callers. As the series proceeds, he makes friends with Charo and Tiger, and also many other Dragon Callers, while improving his skills and knowledge. There are also the Ancients, a mix of Dragonoids and Humans, who are the leaders who look after the six regions of Dragoza. There is also Lance, a Dragonoid and a powerful Dragon Caller, constantly coming across Ace (not as an antagonist, though) and who believes that it is the Dragonoids that will save the planet. The series mainly follows the reason of Drop Impacts, Ace, his friends and many others are trying to figure out the cause of the Drop Impact and to save the planet. Meanwhile, they also need to face Dragonoids at Dragoza, who are suppressing Humans, believing that their race should be the only ones in Dragoza, the only ones who should be Dragon Callers and the only ones who can save the planet