As part of the school trip of Araki Gakuen, the Pacific Ocean Young people on a cruise. However, he was caught up in a sudden storm and the ship was wrecked in a panic.
The main character, Kazuma Shiraishi, woke up on an island he had never seen before. It was Kotoko Yotsuya, his classmate and childhood friend, who woke him up. It seems that the two were thrown into the sea by that storm and drifted to this island. Kotoko is relieved with several horses while being shocked by the sudden event.
In such a survival situation, several horses suddenly thought.
