When 20-year-old college student Haruto Amakawa dies in a traffic accident, he does not expect to wake up in an unfamiliar world in the body of a young boy named Rio. As their memories and personas fuse, Rio realizes that he now also possesses magical powers. He is relieved to find that his burning passion for revenge against his mother's murderers has not subsided, despite his newly changed identity. Not soon after, Rio comes across the kidnapped princess of the Bertram Kingdom and saves her without hesitation. To express his gratitude, the king grants him the opportunity to enroll in the Bertram Royal Academy. Believing this to be a new chapter in his life, he is excited to study at this prestigious academy, but life here proves to be difficult for him, a slum-dweller surrounded by the majestic children of nobles.

Despair War is a battle between ancient guns and contemporary guns. Due to a nuclear war, the world was destroyed. Under the full governance of a world empire, people are living with their freedom taken. Despite the forbidden rule of owning any weapons, there is a resistance that secretly fights against the world empire. They own ancient guns left as art and fight using these. Then, the Kijuushi appear as the souls of the ancient guns. Proud and magnificent, the Absolute Royal are the only ones that can give hope to this world. The story depicts the everyday life of the Kijuushi. Laughter, despair, happiness, confusion, pain; they would still pursue their own absolute loyalty to fight. What do they fight for? What should they protect? (Source: MAL News)

Yoshino Hide is an average girl who always seems to find trouble wherever she goes. One day Yoshino visits a local shrine to pray in order to pass her upcoming test. However, Yoshino sees a blue light coming from inside the Shrine and looks inside to find a mysterious person performing a magic spell. In a stroke of bad luck, Yoshino trips on a small bell and crashes into the shrine, prompting the stranger to catch her. Upon Yoshino's capture, the magic spell spirals out of control and sends Yoshino back in time to the Sengoku Era. Yoshino then encounters Akechi Mitsuhide and Oda Nobunaga. But unlike what really happened during the era, Hideyoshino realizes that everyone in the world is female. She then decides to help Oda Nobunaga find the Crimson Armor which is said to allow the person wearing the armor to conquer all of Japan.

Tatsuya Yoigoshi, a once nationally recognized soccer player, is now a first-year student at Noukin High School. Due to his developed hatred for sports, he has abandoned his previous aspirations to become a famous livestreamer on the internet. One day, Souma Azemichi, a first-year on the kabaddi team, seeks to recruit Yoigoshi and spontaneously interrupts his livestream. Without any expectations, Yoigoshi follows Souma to the school gym, where he witnesses second-years Kyouhei Misumi and Shinji Date engaged in the primal contact sport of kabaddi. Despite ridiculing the rules of play, Yoigoshi is stunned by the intensity of the round. Because of an enticing deal and slight coercion, he agrees to settle the prospect of his recruitment through the most invigorating way: a battle of kabbadi, a team sport played empty-handed.