26-year-old car mechanic Hibiki Mamiya lives with his high school sweetheart of the same age, Kurumi Ogasawara. Life together feels so natural and filled with the warmth of each other's love. It was a happiness they expected would last a lifetime. Hibiki is secretly preparing his proposal to Kurumi when misfortune strikes. A tunnel collapses, trapping him for four days. Barely making it out alive, he discovers a world completely changed. There is absolutely no one around, communication signals are dead, the transportation network is a wreck, and the only information available is the emergency evacuation order being repeated on the radio. Everywhere Hibiki goes, he sees bloodstains. Just what happened to this town?!
While her husband is in prison doing time, Tamaki, the wife of a yakuza capo, runs her spouse’s gang with an iron hand. Meanwhile, Makoto, her younger sister, marries a member of a rival band after being raped by him. The two sisters, united by blood ties but married to enemy yakuzas, will ultimately have to decide whose side they’re on.
Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.
