Everyone yearns to find their true purpose in life. This is also true for Nina Iseri, a 17-year-old girl looking to enroll in a good university, but the world always seems to work against her. On her very first day in Tokyo, she gets lost, ignored, and locked out of her new apartment. However, an unexpected opportunity arises when Nina meets Momoka Kawaragi, one of her favorite guitarists. After Nina joins Momoka for a street performance, Momoka decides they should start a band together. While Nina initially hesitates, her determination grows as they start acquiring more bandmates—the beautiful drummer Subaru Awa, the aloof keyboardist Tomo Ebizuka, and the intelligent bassist Rupa. The five girls face challenges both in the music industry and within themselves, but their shared passion for music never lets them give up on their dreams.

In ancient times, a group of young men devoted their lives to protecting Athena, the Goddess of Wisdom and War. These men were capable of fighting without weapons—a swing of their fist alone was powerful enough to rip the very sky apart and shatter the earth beneath them. These brave heroes became known as Saints, as they could summon up the power of the Cosmos from within themselves. Now, in present day, a new generation of Saints is about to come forth. The young and spirited Seiya is fighting a tough battle for the Sacred Armor of Pegasus, and he isn't about to let anyone get in the way of him and his prize. Six years of hard work and training pay off with his victory and new title as one of Athena's Saints. But Seiya's endeavor doesn't end there. In fact, plenty of perils and dangerous enemies face him and the rest of the Saints throughout the series. What new quests await the heroes of the epic Saint Seiya saga?

The story takes place between the first and second season, where Rimuru confronts the swirling conspiracies in the Coleus kingdom.