Eiga ban Mirai nikki (2000)

Spun off from the Japanese reality TV show Future Diary Yuka has to spend the summer on an island with Taro, who hails from the big city, and Kuniyuki who is from the island. The trio are to follow the instructions of a diary and act accordingly whether they find it natural or not. No one is to breach the covenant and express their own feelings. The adventure may be cut short if Taro has to return to Tokyo.