The Hero King, The Radiant Hero, Yliese Tactician and Fateful Prince they wer summon by the Divine Dragon Naga to go to another world called Remnant to defeat the upcoming darkness. They agree but that comes at great comes regarding their memories and their respective homes. They scatter arcoss the world of Remnant beginning the path of Destiny.
The story will focus on Marth,Ike,Robin and Corrin across  the world of Remnant in different kingdoms. then it will focus on Rwby volume storyline and the relationship between Marth Ike Robin and Corrin x Team RWBY.
Marth x Ruby Rose
Ike x Yang Xiao Long
Male Robin x Weiss Schnee
Male Corrin x Blake Belladonna