Ruphas Mafahl, the black-winged overlord and leader of the Twelves Stars of Heaven, has been vanquished. A man wakes up in the body of the Exgate game character Ruphas, two hundred years after her defeat at the hands of the seven heroes. The game world of Exgate he knew is no longer ruled by humans—and it is no longer just a game. Exgate is a world of its own where the characters think, feel, and live just like he does. Ruphas journeys through Exgate, looking for the long-disbanded Twelve Stars of Heaven. Ruphas is without country, army, or allies. A question remains: what is the real reason an ordinary man was reincarnated into Exgate as Ruphas?

With a smirk, Oota disregards his single-digit test scores and searches for a new source of amusement. He is soon captivated by his classmate Kashiwada, a mysterious student who consistently wears a blank face. Oota conspires to break her placid demeanor through scares and mischievous schemes, though his tactics always seem to backfire. Oota is known as the class clown and is constantly disciplined by his teacher, who claims "his face gives it away." To no fault of his own, he lacks control of his emotions and facial expressions. Kashiwada, on the other hand, seems perpetually emotionless and unreadable—no one knows what she is thinking! Oota and Kashiwada are complete opposites, but that does not stop a unique relationship from developing between them. As they realize their feelings for each other, it raises an important question: do opposites really attract?

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 Krystal 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.

Shinichi Kudou, a high school student of astounding talent in detective work, is well known for having solved several challenging cases. One day, when Shinichi spots two suspicious men and decides to follow them, he inadvertently becomes witness to a disturbing illegal activity. Unfortunately, he is caught in the act, so the men dose him with an experimental drug formulated by their criminal organization, leaving him to his death. However, to his own astonishment, Shinichi lives to see another day, but now in the body of a seven-year-old child.

Perfectly preserving his original intelligence, he hides his real identity from everyone, including his childhood friend Ran Mouri and her father, private detective Kogorou Mouri. To this end, he takes on the alias of Conan Edogawa, inspired by the mystery writers Arthur Conan Doyle and Ranpo Edogawa.

Detective Conan follows Shinichi who, as Conan, starts secretly solving the senior Mouri's cases from behind the scenes with his still exceptional sleuthing skills, while covertly investigating the organization responsible for his current state, hoping to reverse the drug's effects someday.