- Daiyu is the original Giratina of Gaia. Unlike other Giratina, she didn't fight her Arceus for control of world, but instead chose to isolate herself in a world to watch over the world in her own way. There, she served her Arceus, becoming a moderator and occasional strongarm whenever Morrigan didn't want to get her hands dirty.
- Daiyu's slow departure from her Arceus started when humans started to evolve and reside in the world. Daiyu loved humans and found them fascinating; however, Morrigan saw them as nothing but nuisances. As such, Daiyu was in charge of watching them from the shadows as an excuse for Morrigan to not deal with them.
- Daiyu and Lati (the older one, Heidi's brother. Not her child) met and fell in love. They kept their relationship a partial secret, only meeting up and spending time with each other in Daiyu's Distortion World. They talked about so many things, from family to their shared love of humans. They talked about one day posing as humans and marrying, living together as a family whenever Lati was no longer needed by Morrigan or by his siblings...
- Unfortunately, during their relationship, things started to change. Lati's two sisters disappeared and Morrigan was starting to act strange. As such, Lati returned to her with a request: to create a space for a small population of humans and Pokémon to live within her Distortion World and to help move some there. Daiyu obliged without question and helped Lati gather thousands of people from various regions to move in a city that she created from scratch. She named the place "Neo Jubilife City". She promised Lati that, should anything happen to him and humanity, that she will take care of the people within the city and wait for his sisters to return to this world to save it from Morrigan.
- One day, Morrigan waged war against the remaining humans on the surface after aligning herself with Friede, the World Cleanser. Daiyu, Lati, and several other Legendary Pokémon that wished to protect humanity spent the next several years combatting Morrigan and trying to overthrow her; however, they were unsuccessful, with everyone, including Lati and Daiyu, dying.
- Daiyu returned to life in her Distortion World and spent the next several years hiding and taking care of the humans of Neo Jubilife City, hoping that the trust that Lati had in his sisters' eventual return was not unfounded.
- Daiyu was taken in by Heidi and Melony years later as a gift from her and Melony's True Self, Mona. Daiyu recognized Heidi and, later, Lauren, as the two sisters that Lati told her about. Now that she's met them and they've taken her in as a sister, Daiyu hopes that one day, they can help to save Lauren's homeworld from Morrigan's clutches.