Three sisters whose brother married into a remote island tribe inherit the island's guardian god, a giant monster.

An ancient God called Ranga awakens on an isolated island in the South Pacific where it has been slumbering forgotten by mankind. Three sisters living in Tokyo-Minami, Ushio, and Yuuhi Shimabara-discover they have inherited this Island Kingdom, along with the huge God. When Ranga shows up in Tokyo, it soon becomes a source of wonder and conflict for the three sisters that control Ranga, the people who want to destroy it, and ones who want to use it.

The lives and community of the three Shimabara sisters are turned upside down with the discovery that they, through some mysterious twist of fate, have inherited their very own god: the dark, three-storey tall creature Neo Ranga.—Teacakes