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They both love each other, but her desire to return to earth and her family is stronger. The way to go back is to be killed by someone else. I read that she requested him to end her life but I saw some others saying it was an execution instead so I'm not 100% sure about that. Though basically the jist is that he understood her and respected her wishes. Meanwhile the other 3 clowns realised she was a different person (not og eris), fell for her, and wanted to stop her from dying. He helps fend them off and she succeeds.
So he is the ML but there is no end-game romantic interest - she doesn't end up with anyone, instead she fulfills her wish of returning to earth.
Just skipped up to the last chapter and what can i say i like the knight with her . Is he the male lead or something ?