In the spring, male student Makoto Yuki transfers to Gekkoukan High School. However, as he heads to his new dormitory, listening to the music on his headphones, he is stopped. More precisely, time has stopped, and the people who were around him turn into coffins. Makoto learns that this period of time hidden between the minute of midnight is called the Dark Hour, a time when monsters called Shadows appear. Suddenly made the leader of his fellow classmates Yukari and Junpei by his upperclassmen Mitsuru and Akihiko, Makoto must learn empathy, his connection to his comrades, and the meaning of death. With the power of his Evoker aimed at his head, Makoto fights against the Shadows threatening to attack his world from the mysterious tower of Tartarus.

After realizing the value of life and the importance of his own allies, Makoto finally got his smile back. He finds himself learning more about those comrades and getting closer to them. Makoto wishes that everything will continue just as they are. However, little by little, the pieces and people in Makoto's new, happy life begin to fall apart.

The season turns to autumn. The fight of the protagonist and his group S.E.E.S. with the strange monsters called ‘Shadows’ is getting closer to the end. Makoto and his allies engage in life-or-death battles with Shadows in order to end the Dark Hour. Through the battles, some must face the deaths of friends and family, some must notice what precious things must be protected, and some must find meaning in the battles that have occurred. In front of Makoto, the mysterious transfer student Ryoji Mochizuki appears. When the group greets a new morning, the gears of fate begin to turn. A fight revolving around each of the heroes' bonds begins...

To know death, to gaze at death, to face death. Makoto and his allies have grown through the many meetings and partings they have experienced. Their fight might not be for the sake of the world, but for themselves. Even so, they have continued to fight, believing that there are peaceful days waiting at the end of the battle. However, a boy says that destruction is the fate that humanity must shoulder. The boy they believed to be their friend tells them the truth of the situation without an emotion on his face. The season changes to winter. Makoto makes a decision in order to greet the spring that is waiting beyond...