Kanokon SE

The main character and his friends come to an isolated island in the name of extra lesson. One day, a girl suddenly appears in front of Kouta and tells him, "You might lose someone important to you in the near future...." "Lose someone important to me?" He can't forget what she said. At the same time, Tayura meets a mysterious girl in a cornfield. A mystery invites another mystery.... Will they be able to get out of the island safe and sound...?