The first thing the player sees is Battleball Girl Rie running around. After she jumps, she asks the player their reason for coming there. She offers to help the player to take down the yeti, and the player is forced to accept to continue the level. Rie joins the Party and helps in the fights.
After the first fight, Rie and the player will work together to destroy the rocks in the path. The second fight passes and the player will use the hook to transport themselves to the next fight against two yetis. Upon defeating them, Rie will use their corpse to destroy the rocks in the path.
The final battle comes, and after defeating the Yeti, a cutscene shows the Party and Rie eating the Yeti's meat. Rie says that yeti's are the best training buddy because their meat is very tasty. The player is forced to eat the meat and find it very tasty, as Rie said. Everyone spent the night having yeti barbeque and chatting about battleball.
Taking the villagers communal food does not affect the outcome of the level in any way, and it is not the treasure needed to complete the level, since the real one is just some steps further.