There were Origin Gods in Ancient Times. They were the ones who created "Gaia," the planet where Life exists. Because they were not allowed to interfere with the planet because of the cost of developing it, they decided to create High-Ranking Twelve Goddesses. As their sole responsibility was to look after the organisms living on the planet called "Humans."  And grant them blessings in each of their donations to them. The Goddess of Creation, Goddess of Life and Death, Goddess of Destruction, Goddess of Fertility, Goddess of Water, Goddess of Fire, Goddess of Earth, Goddess of Wind, Goddess of Light, Goddess of Origin, and eventually the Goddess of Time are those that were created at first. However, one of the Twelve Goddesses refused to take any action or support the other Eleven Goddesses. The Goddess of Darkness was her name. "Luminaria." She was expelled from the Ancient Heaven and imprisoned in a remote location for thousands of years, but just 100 years later. In the other world, a high school girl named Yuuki Kirisaki was summoned, but there was a fault. She was considered "Weak" and was exiled from his summoned country. Desperate for power, she hunted in the neighbouring country's Magic Forest of Zernania and leveled up to 30. Prior to sleeping. She met the Goddess of Darkness in his dream. Is this fated meeting? Or a bad omen in the near future for Yuuki Kirisaki?

In the technological era of 2027, where cars are run on batteries, sophisticated types of technologies. A company called "GSX Corporation" launched a game called GunSword Online, or GSO for short. And it uses a type of Virtual Reality Headset called Gearlink. Where the user can use the headset's full-dive capabilities.  Unlike Amusphere, The Gearlink carries its own set of batteries like the NerveGear, but it does automatically log off the user from the game when they are in any sort of danger in reality making the user of the VR Headset safe. It also notifies the user of their body's systems in real time, even in game. 

Everyone over the world celebrates "White Day" on February 14th, which is a reversal of the original Valentine's Day. Men will return the favor to ladies on White Day. Even in love, not everyone is as fortunate as they could be. Origami-san's luck isn't exactly average every single day. Her luck can sometimes so extremely awful that she usually passes all of her exams except one, PE, which stands for Physical Education. But her terrible luck turned around one day later when she found seven letters in her Student Shoe Box near the entrance, not one, two, or even three. She was so perplexed by this that she didn't touch any of the seven letters in the Shoe Box for a week, until she mustered the bravery and conviction to take them out, and eventually read its contents inside one by one.