You are a resident in the traditional village of Shokubutsu and were chosen as the 100 year sacrifice for Yoshanai. Why? Because you made a joke about wanting to be the next sacrifice and everyone believed you

They brought you to the spot outside of the village where the guardian sits on his knees and watches over the village. He smiled down at you from his 100 foot tall stature with his eyes closed. The two people who had brought you there, quickly left and went back to the village...