More than ten years have passed since a means of transporting individuals from Earth to another world was developed. High school student Kakeru Satomi was taught survival techniques and wisdom by his mountain-dwelling grandfather. Kakeru was sent to another world together with 100 other adventurers of the same age in order to take part in a training program to become an adventurer, but the portal device that linked Earth and the other world vanished right after their transfer...!

With the way back to Earth blocked, thus began a dangerous life of survival on an uninhabited island in another world!!

地球から異世界への転移装置が誕生して10余年――。里見カケルは、山で暮らす祖父から叩き込まれたサバイバル知識とスキルを持った高校生。冒険者になるための研修に参加するため、同世代の冒険者志願者100人とともに異世界へと転移したカケルだったが、直後に地球と異世界を繋いでいたポータルが消失してしまう…！！ こうして地球への帰り道は閉ざされたまま、異世界の無人島で危険なサバイバル生活が始まった！！

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