Various! Seirei Gensouki: Spirit Chronicles x Reincarnated! Princess! Oc Insert

Amakawa Haruto and Amakawa Higashi are two young men who died before reuniting with their childhood friends who disappeared five years ago. Rio and Riku are twin brothers living in the slums who want revenge for their mother who was murdered in front of them when they were five years old.

Earth and another world. Four people with completely different backgrounds and values.

For some reason, the memories and personality of Haruto and Higashi who both should've died are resurrected in Rio and Riku's bodies. As the two are confused over their memories and personalities fusing together, Rio and Riku decide to live in this new world.

Along with Haruto and Higashi's memories, Rio and Riku awaken an unknown "special power", and it seems that if they both use it well, the brothers can live a better life. But before that, Rio and Riku encounter a kidnapping that turns out to be of a princess of the Bertram Kingdom that they live in.

After saving the princess, Rio and Riku are both given scholarships at the Royal Academy, a school for the rich and powerful. Being two poor orphans in a school of nobles turns out to be an extremely detestable place to be.

Fortunately for them, another fellow princess from a different kingdom, who has some secrets of her own, is there to help them survive and prove to everyone that they deserve to be here or die trying!