Elly is the Village's Shared Wife

The protagonist, Kyle (name changeable), and his younger sister, Elly, were attacked by monsters when they were young. - Separated from their family by death, they were eventually taken in by a village in a remote frontier. - Kyle resolved to become an adventurer to protect people from monsters, spending every day immersed in his training. - His younger sister supported him from the shadows, almost like a mother would… - When Kyle reached adulthood and announced he was leaving the village for the Royal Capital, - Elly told him she would not go with him and would remain in the village instead… - Time passed, and after a year of living in the Royal Capital, Kyle—having fulfilled his dream—returned to his hometown. - But the sight that awaited him in the village was…​