Koi-Labo.

An university student majoring in arts, Ryou heads to Kaikyouku to become a teacher-in-training. While traveling by boat to the town, he could hear an unpleasant sound. A girl nearby offers him a pair of headphones and tells him that he can’t live on the island without them. Later he finds out that her name is Karen and she is the class rep in his assigned class.