It all starts with a video game. A simple video game. Sako and Kiyomi purchased a brand-new MMORPG called "Qurecynthia", only to get sucked right into the game when choosing their classes. It is quite the inconvenience for Sako as she has a life to get back to. For Kiyomi, not so much. But still, they must find a way to return to their reality. Fortunately, death is not permanent, but there are potentially heavy penalties, such as varying degrees of pain and losing all their gear.

There is at least one way, and that is to defeat the Demon Lord, the hardest boss in the entire game. It is a tall task. They must prepare themselves by grinding out levels and obtaining endgame gear, then maybe they will stand a fair chance against her despite the fact that hardly anyone can vanquish her: her stats and abilities are absurd. And sadly, the moderator they encounter refuses to nerf her.

Sako and Kiyomi will have to be smart and persistent in their ultimate goal. It will take much time and much effort. But each has a head start: Sako is a martial artist, and Kiyomi is a veteran of video games. With these two advantages, they are already much more powerful than the average player.

...But they are still just high school girls, so mistakes are inevitable...