After her boyfriend breaks up with her for another girl, college student Akane Kinoshita wrestles with a broken heart and the memories he left behind. Loading up Forest of Savior, the MMO they used to play together, she forms a plan to get back at her ex-boyfriend through an in-person event for the game. In the process, she runs into someone unexpected: Akito Yamada, a gaming legend who just happens to be her guildmate. Desperate for support, Akane ropes the asocial Yamada into helping with her scheme and lending her a shoulder to cry on. The differences between Akane and Yamada soon become apparent as they spend time together, yet they cannot help but notice each other's inner qualities. As the two gain more experience with one another in and out of the game, their tentative acquaintance may level up in a way neither expects.

On a mysterious night that seems to last for a year, an ordinary college student continues to chase one of his underclassmen, a girl with black hair—the girl of his dreams. Up until now, he has been relying on a simple plan, which is to calculatingly bump into her every day while making it seem like a meaningful coincidence. However, his efforts remain futile as their relationship is not progressing at all. Meanwhile, the black-haired girl believes that everything is connected by fate and endeavors to experience as many new things as possible, leaving it all for destiny to decide. While strolling along the lively streets of Kyoto, she discovers that the very beginning of her fateful journey—a book she had as a child—is currently being sold in a second-hand bookstore. Upon knowing this, the college student eyes another opportunity to run into her by chance: this time, he hopes to get the book before she does and finally grasp the thread of fate that could connect their hearts.

Tanya Degurechaff is a young soldier infamous for predatorial-like ruthlessness and an uncanny, tactical aptitude, earning her the nickname of the Devil of the Rhine. Underneath her innocuous appearance, however, lies the soul of a man who challenged Being X, the self-proclaimed God, to a battle of wits—which resulted in him being reincarnated as a little girl into a world of magical warfare. Hellbent on defiance, Tanya resolves to ascend the ranks of her country's military as it slowly plunges into world war, with only Being X proving to be the strongest obstacle in recreating the peaceful life she once knew. But her perceptive actions and combat initiative have an unintended side effect: propelling the mighty Empire into becoming one of the most powerful nations in mankind's history.

On a hot summer day in Kyoto, a young man walks toward his apartment, dreaming of turning on the air conditioner and cooling down. But before he can turn his dream into reality, disaster naturally strikes in the form of Ozu, who spills soda all over the remote. With the air conditioner rendered completely unusable, the man and his friends are left to suffer in the terrible August heat. Just when all hope seems lost, the group finds a true-to-life time machine in their storage room. Not knowing the dire consequences of doing so, they decide to travel back to the past and grab the remote before Ozu even has a chance to destroy it. What awaits them on the other side is a staggering adventure none of them are prepared for.