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Alto Goldfilled, a diligent student at the Ortigia Academy of Magic, aspires to become a powerful sorcerer. But he is unable to become one as, despite his excellent grades and strong commitment to his studies, he fails his summoning class. With the threat of repeating a year hanging over his head, Alto tries following an old, worn-out grimoire in a desperate attempt to resolve his situation. To his surprise, he succeeds and summons a powerful demon named Vermeil. As a sign of gratitude for releasing her, Vermeil agrees to become Alto's familiar, sealing their relationship with a deep kiss. Little does Alto know what else he is capable of and what Vermeil's past hides. [Written by MAL Rewrite]

A 20-year-old shut-in is suddenly transported from his apartment, only to appear in front of a goddess who offers him a second chance at life. Although she grants him overpowered magical abilities in this new world, when he awakes as the newborn Prince Reinhardt, his talents are only measured at Level 2. Thinking their child to be an abysmal failure, his royal parents abandon him in the woods. There, the prince, who names himself Haruto, encounters Flay, a Flame Fenrir who decides to devote her life in service to him. Haruto's relative, Gold Zenfis, meets them both in the woods and decides to adopt the child as his own. Nine years pass with Haruto under the care of the Zenfis family. His mastery over his overpowered barrier magic increases by the day, though Haruto would rather not use it to help others. He practices his magic in secret, preferring to have his family believe that he is weak. However, his younger sister, Charlotte, discovers his strength, and with the assistance of Flay, Haruto protects her and the rest of the Zenfis family from harm. With a shifty plot stirring in the kingdom, Haruto only wishes to stay inside and watch anime, but it seems he will have to use his magic to keep the family that took him in safe. [Written by MAL Rewrite]

A decade ago, princess Krystal Novaty “Hime” Nokanatika traveled from another world to escape assassination attempts by an evil force. When she arrives in modern-day Japan, she encounters Haruto Satou. With him she shares a promise: he must forget what he has just witnessed, and the two will become friends. Now heading back to the Nokanatika Kingdom to fulfill her royal duties, Hime bids farewell to Haruto. However, when the young man suddenly remembers his first meeting with Hime, he rushes to the location where she first appeared and crosses the dimensional portal to be reunited with her. His arrival disrupts the marriage ceremony between Hime and prince Marmarugias Gisaras. The wedding is brutally interrupted by the attack of an abyss monster who threatens the princess' life. Acting impulsively, Hime decides to exchange rings with Haruto, which grants her new husband light powers that permit him to slay the monster. Now dubbed as the Ring King, Haruto must marry four other princesses to acquire new magical powers and have a chance to prevail in his fight against the enemy of the world: the Abyss King. [Written by MAL Rewrite]