In 2024, the computer network prevails throughout daily life. Sora Yuuki is a 14-year-old girl. One day, she is invited to an online game The World. After an accident in the game, the real world begins to deform.

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Winning the legendary characters Kite and Black Rose from an event held by the creators of the MMORPG The World, Shugo and his twin sister Rena step into The World. Together, they complete events and quests, along with their new friends Ouka, Mirelle, Hotaru, and Sanjuro. Soon after, mysterious monsters appear, and death by these monsters causes players to slip into a coma in the real world. Only Shugo and Rena can solve this problem, but why are they being targeted, and what secrets is the game hiding?

Since the discovery of Samon Syndrome 30 years ago, thousands of young people have traveled to fantasy worlds, the few returnees managing to keep the special abilities they acquired in those parallel universes. Akatsuki Ousawa, known as the Rogue Hero, discards his peaceful life in the fantasy world Alayzard to face new challenges upon returning to Earth. He comes back with Miu, the daughter of the Demon King he defeated, and is now forced to hide her true identity by having her pose as his little sister. The two soon join Babel, a special school designed for those who have acquired special abilities and magical powers through their journey to a fantasy world. Babel was seemingly founded to train young interdimensional travelers and guide them to the right path for the sake of humanity and themselves, but its true purpose remains unclear to the pseudo-siblings. Will Akatsuki and Miu be able to overcome the hostile, powerful student council and uncover the forces at play behind the scenes?