The yakuza have been using this facility as a 'disposal' site for a while and paying off some of the villagers (hence the weird rules set in place by the previous caretaker/Mama), one of which was the sister of one of the two guys. Since the whole situation's gone to hell and will possibly have its cover blown, the villager decides to clean up and personally take vengeance on the current caretaker, Sakuraku, who was directly involved in his sister's death, though it was actually perpetrated by the MC, Tooru (the probably villager doesn't know).