Comment by Harlock on Isekai NTR ~Shinyuu no Onna wo Saikyou Skill de Otosu Houhou~ - Chapter 40

Didn't the previous Hero friend return to the original world?
He gave up his wish, so the Hero can return home, so MC stayed behind.
How did that guy (Hero) that should have returned to Japan, got dragged back into this world ?