Once upon a time, an unidentified enemy, the Unknown, suddenly appeared. The "Super Evolutionary Railway Development Agency," had developed the "Shinkalion," a robot that transforms into a bullet train, as a countermeasure against this threat.

To say that Mona Kawai is cute would be an understatement; she is breathtaking in every single way, and she knows it. At school, she is fawned over by boys and girls alike, and she graciously welcomes it all as a natural reaction to her irresistible charm. That is, until she comes across Medaka Kuroiwa, the boy who is seemingly immune to her overwhelming charisma. She goes out of her way to talk to him and even dials her cuteness up a notch, but no matter what she tries, Mona cannot wipe the scowl off Kuroiwa's face. Backed into a corner, Mona is forced to use the most devastating weapon in her arsenal: her physical allure. Such drastic measures would leave other boys foaming at their mouths, but Kuroiwa remains unfazed by her attempts. Little does Mona know that the only reason Kuroiwa just barely abstains from succumbing to her charms is because he is training to be a monk and thus trying his best not to be held down by worldly pleasures. As Mona goes all out to entice Kuroiwa, she fails to realize that his unintentional chivalry might just make her fall for him instead.

Early Reins features six beautiful women on a train en route to Sunshine Hill in the early 1800s. When the train is highjacked by robbers and the soldiers on board are caught unawares, another surprise is in store: these lovely ladies can fight! The heroine emerges as Margarette, a young woman determined to become a sheriff although she is somewhat lacking in experience. She gains plenty on this trip, however, and the ragtag team of Western warriors joins forces with another passenger, Spencer, to fight some nefarious bandits and guide the train to safety.

Dennosuke Uchimura is your normal, everyday salaryman trying to climb the corporate ladder. But then he’s summoned to a terrifying fantasy world by the Demon Overlord, who offers him a new job—as one of the Heavenly Kings in his army, with full benefits! Uchimura may not have muscles or magic, but he does have an office worker’s skills and savvy. Will they be enough to keep him alive?