Luke Skywalker successfully saved his Father from the Dark Side and brought peace to the Galaxy. Sadly he died by Hands of Emperor by doing so, as his Father died by trying to save him.
Kiana Kaslana was Controlled by Eldritch The Will Of Honkai, and got saved by Houraiji Kyuushou, who managed to defeat her and free from her misery and died after Millennia of suffering.
They were brought in another dimension by God, who saw that both of them couldn't get their happy ending and gave them new chance to live and help the world by changing it, and he send his granddaughter, Luciela to help them in a new world similar of their own.
How this will turn out? And will they succeed? Only time can tell.
Luke Skywalker (Legends)
Confident Luke
Jedi Master Luke
GGZ Kiana
Smart KianaCrossovers:
Date A Life
Honkai Impact
Highschool DXD
Genshin Impact
Honkai Star RailLuke X Kiana X Luciela, possible Harem
Let me know in the Comments what you think about this.