The story centers on an RPG that people call "kusoge" ("crap-tier game," referring to games with quirky or badly implemented mechanics and design). The main character Lidays decides to change the game's story, meeting with other characters while the game isn't being played. But as they flub their lines, the situation spirals out of control. (Source: ANN)

The day is as normal as it can be in high school as the students peacefully go about their everyday activities until an unprecedented catastrophe strikes the school, killing every person in its wake. Guided by what seems to be a miracle, a handful of students are fortunate enough to be reincarnated into another world as nobles, princes, and other kinds of people with prestigious backgrounds. One girl, however, is not so lucky. Being reborn as a spider of the weakest kind, she immediately experiences the hardships of her dire situation. Even so, she must press on to survive the numerous threats that endanger her life. Discovering that her new world has a system like that of an RPG, she tries her best to hunt prey and defeat monsters to level up and evolve. As she gradually grows stronger, she hopes one day her efforts will be rewarded, and that she will be granted a better life. [Written by MAL Rewrite]

The virtual world inside the scub coral (intelligent coral-like lifeforms) created by Eureka... The people from that virtual world appeared on Earth ten years ago when it collapsed. Since this large-scale amalgamation, the humans from the virtual world call themselves "Green Earth" and the original Earth humans call themselves "Blue Earth," and they've come to cause various conflicts with each other repeatedly below the surface. Eventually, Dewey Novak, a senior officer in the Green Earth Armed Forces, rises together with his comrades and finally sets a large-scale terrorism plan into action in order to protect their own dignity. Meanwhile, Eureka, who is detested by the world as the main cause of the chaos, has become a high-grade combatant with the UN's A.C.I.D. unit. Live in order to keep this world at peace... This was the path of atonement she chose. One day, she receives an order to protect a girl named Iris, a new "Eureka" who has the ability to control scab coral. They fight a lot at first but gradually come to understand each other through their lonely escape. Soon the world faces a crisis, and when that happens, Eureka draws on every last ounce of her strength as she fights. "I want to protect Iris and this world." What future awaits her at the end of that wish of hers?

Once you fall for someone, you can't stop the love. A strange encounter spurs the meeting of Amakusa Ryou, a high spec businessman who is loose with women, and his high school sister's best friend, Arima Ichika. From there, he falls madly in love. On one hand, he approaches her with almost too straight-forward methods, while she responds simply disgusted, insulting him without hesitation... and he takes it as her way of showing love. This is a romantic comedy about a twisted elite employee and a normal otaku high school girl. (Source: MU, edited)