Iori spends her holidays working as an actress, shooting a movie at the waterside of a lake, which has a mysterious small island called Lover's Island at its center. Ichitaka, on a biking trip, coincidentally makes a stop at the location where Iori is shooting. Meanwhile, Itsuki returned from her job as a molding artist in the United States and plans to meet her childhood friend Yosuke to fulfill a promise they made ten years ago. Walking along the railroad track she, Yosuke and Ichitaka went along ten years ago, Itsuki is confused when she sees the lake with the small island in it at one side of the track, as she does not remember there being a lake. Yosuke, along with three of his biker friends, is also on his way to meet with Itsuki. However, the other bikers reveal to him that they are planning to rape Itsuki. He drives ahead to save Itsuki from them, but drops from his motorbike just as he crosses her path. The other bikers close in on him, stab him and let him drop into the lake (which he can not remember being there when he was a child). As the bikers spot Itsuki, she runs away.
Yasumasa and his friends want to pick up Iori at the Lake Side Hotel, but she already left as her shooting finished early. Meanwhile, she meets Ichitaka and they decide to take a boat and row across the lake to the island. As they arrive, Ichitaka recognizes the island as the place he, Yosuke and Itsuki visited as children, although back then there was no lake around it. Just then, Iori and Ichiitaka hear Itsuki on the other side of the lake screaming for help as the bikers found her and now want to rape and kill her. Ichitaka quickly rows over, leaving Iori alone on the island. He manages to hold back two of the bikers, but their leader knocks Itsuki out and abducts her on his motorbike. As it starts to rain heavy, Ichitaka follows them, while Yasumasa and his friends, who suddenly show up, take out the two bikers. Ichitaka takes a shortcut across a fragile old plank bridge to catch up with them, but the bridge collapses. Swinging down on one of the ropes that hold the bridge, Ichitaka grabs Itsuki from the back of the motorbike. Together, they drop into a stream and as they regain consciousness, find themselves at the waterside of the lake with the ghost of their childhood friend Yosuke standing nearby. Across the lake, they spot Iori on Lover's Island, close to drowning as the heavy rain threatens to flood the tiny island. As no boat is around, Yosuke reminds Ichitaka of a secret cave they found nearby when they were kids, that leads to the island. However, the cave is flooded with rain, and Ichitaka has to dive through the last part and manages to save Iori from drowning at the last second.
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