On an isle, folklore says monsters have dwelled there since antiquity. Consequently, locals christened it "Monster Isle." In truth, the creatures are amiable yet wary of people. A youngster called Kotake stumbles onto the shore. A cantankerous crimson ogre named Naki ends up looking after him. What odd outcomes could arise from this meeting and perhaps the island's ancient secrets will finally surface, reshaping both monster and human hearts.