In 1945, World War II is at its peak. As Japanese cities are fire-bombed and the nation is cornered by US forces, Japan is collapsing under the immense pressure. Gen Nakaoka, a bold, free-spirited young boy, lives in Hiroshima. Struggling with wartime scarcity and barely making ends meet, Gen and his family are hopeful that the conflict will soon end with Japan's imminent defeat and their city unscathed. However, unbeknownst to them, their fate is already sealed with the impending dropping of Little Boy, the US atomic bomb set to cause the devastating cataclysm that will forever change Japanese society.

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?

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The year is 1866, the twilight of the Tokugawa era. As Japan boldly moves into a new age, one man couldn't possibly care less. That man is Kumosuke Haguregumo, a retired samurai who has since become the town fool. Though he still carries his twin-bladed katana, Kumosuke spends his days smoking, drinking, and womanizing, rarely coming home before dawn. At home, however, wait his wife and two children, Shinnosuke and Ohana, who are constantly troubled by Kumosuke's antics. As Shinnosuke grows older, he begins to understand the world around him. Troubled by his father's reputation, Shinnosuke attempts to live a life of honor, though finding what honor means in a turbulent era is difficult. As Shinnosuke navigates his relationship with his father, countless other warriors struggle to find their place in the ever-changing world.