Far away from the reaches of demons and war, near the borderland of Zoltan, D-Rank adventurer Red lives a normal existence. Through perseverance and hard work, his dream of starting his own apothecary and peaceful life in the countryside finally came true. Abruptly, Red gets a live-in partner and assistant named Rit—the princess of Duchy Loggervia and an adventurer herself—who gives everything up to join him. Although honest, kind, and loved by all, Red has a secret shared only with Rit: his real name is Gideon, brother of Ruti Ragnason, the Hero and a former member of her party. Ares Drowa, the Sage, kicked Red out of their party after their war against the Demon Lord after deciding he was weak and insignificant. Now, even though Red has left the Hero's party behind by assuming a new life together with Rit, his past has yet to let go of him.

Urano Motosu loves books and has an endless desire to read literature, no matter the subject. She almost fulfills her dream job of becoming a librarian before her life is ended in an accident. As she draws her last breath, she wishes to be able to read more books in her next life. As if fate was listening to her prayer, she wakes up reincarnated as Myne—a frail five-year-old girl living in a medieval era. What immediately comes to her mind is her passion. She tries to find something to read, only to become frustrated by the lack of books at her disposal. Without the printing press, books have to be written and copied by hand, making them very expensive; as such, only a few nobles can afford them—but this won't stop Myne. She will prove that her will to read is unbreakable, and if there are no books around, she will make them herself!

Yuusuke Yotsuya has always disliked Tokyo, but he especially hates the people who live in it. He would rather thrive in a virtual world than try to get along with those around him. At the end of one school day, he sees the popular athlete Iu Shindou talking to Kusue Hakozaki, who spends less time in school due to illness. But when he looks away from the two and back again, they have seemingly disappeared. Mere moments later, Yotsuya enters a state of free-fall, and the world begins to change around him. Dropping into a large pool of water, the first thing he sees when he comes to his senses is an assortment of enormous monsters. He soon finds out that he has been brought into a game world by Shindou and Hakozaki and that he must complete a quest within 14 days. There is one thing that separates this world from the real world: anyone who dies will be brought back to life in 30 seconds as long as one party member is alive. Tasked with numerous quests that increase in difficulty over time, Yotsuya, Shindou, and Hakozaki attempt to discover the mystery behind the perplexing game world.

Rimuru Tempest is victorious following his climactic showdown with Demon Lord Clayman. With Diablo's aid, the war with the Falmuth Kingdom ends decisively in Rimuru's favor. Fueled by increased migration and the integration of Jura Forest, the nation of Tempest undergoes rapid growth. Rimuru's victory shifts the balance of power, giving rise to a renewed period of peace—but whether that peace will last is another matter. Yuuki Kagurazaka and Kazalim are conspiring with the Harlequin Alliance to bring about Rimuru's downfall. Furthermore, the Western Holy Church continues its intolerant crusade against Rimuru and his non-human subordinates. Both allies and enemies engage in a battle of wits, carefully advancing their agendas without shattering the delicate status quo. But once the first domino inevitably falls, the race to supremacy begins.