A huge, 2 kilometer cube appears in the middle of Haneda airport. A passenger plane is absorbed inside it, and no one knows if the passengers are dead or alive. The Japanese government convenes an emergency meeting to deal with this unexpected event, and tries various things to learn about the cube, which it names "Kado". But when even the most powerful weapons fail, what's left for the people of Japan to do?

Shindo is a negotiator with the Japanese government, highly renowned for his skill and dedication to the job. Just before he's scheduled to go on a month long break, he's given the task of buying out a plating factory to convert to a multi-use building. The terms of the buyout are excellent, and the owner of the factory is very interested. But there's more to the deal that meets the eye, and Shindo goes the extra mile to ensure that both parties to the negotiation get what they really want.

In an underground shelter-city encased in ice, Setsuna meets a young girl named Rinne and begins helping her with a mysterious invention. It can apparently help save the world, but its true nature is unclear. Meanwhile, the city itself will very soon perish.

When they awoke, they were looking up at the blue sky from five years ago. It was the mysterious island where Rinne and the real Setsuna had been before parting ways forever. Rinne feels excited to see the real Setsuna again and finally settle things, but what they find are more riddles, tears, and darkness.

Rinne and Setsuna thought they had left their pasts behind. Then, Rinne is a horrible memory she cannot ignore. Meanwhile, Setsuna is faced with a new revelation. The situation changes suddenly as Rinne, believing new information she just learned sets out into the stormy night and raging sea, and disappears.

The darkness has lifted for Karen and Sara. In bed, Rinne murmurs, "Next time, will you be my Setsuna?" She and Setsuna enjoy a day of happiness together. Rinne has prepared herself bid farewell to the past and set off toward tomorrow. But Kuon seems to have misgivings.

“I don’t have time to spare!” Sara yells hurriedly. She has a hypothesis as to why Setsuna came back in time and that he and she are destined to be together, but Rinne confronts him with a dark truth. Crimson flames lick the heavens, bringing an end to a bloody history.

Although it was by Karen’s request, Setsuna does something unthinkable. They go to the mainland so that Karen can escape and go to see her mother. Why did she cry while Setsuna watched over her? Meanwhile, Sara is getting close to something.

Setsuna, Sara and Karen try various ways to get Rinne to come out during the day. Their fun time is interrupted the moment when Rinne sees a hidden shack. After that, Rinne tries to stop thinking about the past, but Karen makes a decision to face it down.

Setsuna begins to research soot blight syndrome to understand the shocking statement Rinne makes. The endemic disease keeps the island isolated and toys with Rinne, Karen and Sara’s fates. But Rinne’s mother Kuon knows something unexpected.

Rinne and Rinne... A truth about these two girls is brought to light by a photograph, and Setsuna makes a decision. Will it make everyone happy? A new future awaits once this great mystery is solved. No more hesitating. It’s the eternal finale.

When Setsuna opens his eyes, he’s back on the same beach in the summer. Everything happens just as it did before. Setsuna rushes to reach the one moment he wants to change. But he learns learns a shocking truth.

Setsuna rises up to create a future for a city without hope, but tragedy strikes time and again. Meanwhile, Rinne finishes her invention and Setsuna sets out for the future to save mankind’s existence. Just before he goes, Setsuna makes a promise to Rinne.

When he wakes up, Setsuna has no memories. He is on the island left behind by time, Urashima. Everyone he meets is mysterious and puzzling. At night he is surprised by a girl singing on the beach, and somehow says her name. “Rinne…”

The Black Round Table's next target is the hospital where Kasumi is kept. Will Ren be able to protect her?

The LDO puts its terrifying plan into place as they prepare to open the eight swastikas across the city. Can Ren and Shirou stop them?

Ren is captured by the Black Round Table. He learns who they are and what they want.

Fujii battles the enemies on the bridge. He temporarily gains the upper hand, and then the terrifying Lord Heydrich appears.

Ren wakes up with a blonde girl in his bed! He and Kasumi adopt her and take her around the city, buying her clothes and taking her shopping. Then he has a meeting with his old friend Shiro.

The plans of the Black Round Table are revealed as one of their members teaches Ren how to use his powers. He's quickly given the chance to put his new strength to the test as another member kidnaps Kasumi!