Chikawa, lives on a remote island. Ichimon Ayumi comes from the city to spend summer.  An accident happens, when they wake up, they find themselves in front of a cave called “Kaiju-san’s Hole” … From their meeting, strange things began to happen on the island …

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離島で暮らす、千川棔。都会から来た、一門歩流夏。溺れた歩流夏を助けた棔。2人は目を覚ますと、“かいじゅうさんの穴”と呼ばれる洞窟の前になぜかいた…。2人の出会いから、島では不思議な事が起こり始め…。