Ai is a self-reliant girl that moves to Animal Village. She makes friends with the various villagers as she settles into the village. One night as she walked along the beach, she finds a message in the bottle. It sets her off on a quest of planting pine trees around the village to fulfill a miracle on the eve of the Winter Festival.
(Source: Anime News Network)
— Description from AniList community (anilist.co).
