From a young age, Kurumi Mirai has aspired to become a magician. Driven by her ambition, she has spent her childhood preparing to join the prestigious Rettoran Academy of Magic. Although Kurumi excels in the selection exam, her dream is crushed when she is not chosen for the elite magic class. Admitted to the standard class at the academy instead, Kurumi soon befriends Maki Kumiiru, her new roommate; and Yuzu Edel, another girl unhappy with her placement. However, to everyone's surprise, their homeroom teacher, Minami Suzuki, promises to teach the class magic anyway. Although skeptical at first, the girls start to believe that this may be their second chance at realizing their dreams and becoming wonderful magicians.

The moments Keisuke Niijima shared with his wife, Takae, were the happiest in his life. After their first meeting as coworkers, the bond between them gradually became stronger. They eventually married and were blessed with a daughter named Mai soon after. However, following Takae's death, time seems to have stopped for Keisuke, resulting in his inability to build a proper relationship with his daughter. Ten years later, the gloomy Niijima household is bound for change when a little girl knocks at the door—claiming to be Takae's reincarnation. After confirming her identity, Keisuke's world brightens once more as he revels at the thought of making new memories with his beloved family. Unfortunately, this fortuitous miracle comes with its obvious drawbacks, and one mistake will spell more tragic consequences for Keisuke and everyone else involved.

As introverted colleagues at a travel agency in Tokyo, Takuya Oohara and Rika Honjouji both cherish their happily single lives. After work, home is where they feel most at ease: Takuya unwinds with his cat, while Rika studies various maps. However, an uncertain future looms over their treasured tranquility when their company plans to open a branch office in Alaska within one year and transfer an unmarried employee there. During a day off, Takuya and Rika accidentally meet and, despite never having spoken before, open up to each other about their relocation fears. Feeling encouraged by Takuya facing the same predicament, Rika suddenly proposes a daring solution—to pretend to be engaged for 365 days. Takuya accepts, but little do the two know that the path to marriage may, in many ways, change forever the very lifestyles they struggle to preserve.

Guts, a man who will one day be known as the Black Swordsman, is a young traveling mercenary characterized by the large greatsword he carries. He accepts jobs that offer the most money, but he never stays with one group for long—until he encounters the Band of the Falcon. Ambushed after completing a job, Guts crushes many of its members in combat. Griffith, The Band of the Falcon's leader and founder, takes an interest in Guts and duels him. While the others are no match for Guts, Griffith defeats him in one blow. Incapacitated and taken into the Band of the Falcon's camp to recover, Guts wakes up two days later. He confronts Griffith, and the two duel yet again, only this time with a condition: Guts will join the Band of the Falcon if he loses. Due to his fresh injuries, Guts loses the fight and is inducted by Griffith. In three years' time, Guts has become one of the Band of the Falcon's commanders. On the battlefield, his combat prowess is second only to Griffith as he takes on large groups of enemies all on his own. With Guts' immense strength and Griffith's leadership, the Band of the Falcon dominate every battle they partake in. But something menacing lurks in the shadows, threatening to change Guts' life forever.