The vacation of a lifetime, a trip to a remote island full of geniuses... and murders. Iria Akagami, heir to a powerful family, has lived for five years on the island of the Wet Crow Feather, a tiny strip of land surrounded by the Sea of Japan. She was raised in luxury, revered as a princess, until she was ousted by the leader of the Akagami Foundation, ending up living on the island with her two maids. However, the girl is not alone: she has invited the best minds in Japan to stay on the island with her.