Chapters 3-12 of the light novel detail the protagonist, Kao (Shikano Kaoru), and his companions' experiences ten years after being transported to another world. The narrative begins with a recap of the previous work, where Kao, a 49-year-old dispatch worker, and 101 of his colleagues were suddenly transported to a fantasy world with their office floor. Kao, possessing game-like abilities from a past online game, helped them establish a new life, including opening a bento shop called "Yamato-ya." A major turning point in the previous story was the revelation that Earth had been destroyed by a meteor, leaving them with no way back.
In the current chapters, a divine revelation occurs: Earth has survived a catastrophic event, and a path back has opened. A god appears in the dreams of the transported individuals, offering them a choice: remain in the current world or return to Earth within ten days. Kao and the Yamato-ya staff, having found a new life and family in this world, initially choose to stay. However, five of Kao's former online game companions, including Tauro, Kanta, Mireille, Anessa, and Yugo, decide to return to Earth to reunite with their families. This decision deeply affects Kao, who struggles with the impending separation from his friends.
The chapters then delve into the preparations for the returnees' departure. Kao, initially believing he is content to stay, experiences a profound realization that he is also conflicted about returning. He grapples with feelings of purposelessness and a fear of being left behind, especially as his adopted children, Mark, Arisa, and Dan, have grown and become independent. This internal conflict is brought to the forefront by Arisa's direct question about his desire to return. Kao confesses his own uncertainty and his fear of being a "useless old man" without his magical abilities and the purpose he found in this world.
Meanwhile, the returning group meticulously plans their departure, focusing on gathering supplies and information about Earth's current state. They learn that while the main meteor impact was averted, smaller meteorites will still fall, causing widespread disaster. The narrative highlights the emotional goodbyes and the efforts of those staying behind to ensure the returnees are as prepared as possible, even gifting them items from the bento shop and the dungeon's B2 stores.
The chapters culminate on the eve of their departure. A crucial detail emerges: the god's initial offer was a choice, and not everyone may have explicitly made one. Kao realizes he never truly chose to stay, only reacting to others' decisions. As the portal is about to open, the returning group, along with Kao and the Yamato-ya staff, gather. In a moment of panic and confusion, Kao, along with Mark, Arisa, and Dan, are unexpectedly drawn into the portal as it opens. The narrative concludes with Kao waking up back in his office floor at Yamato Shoji, ten years prior to his initial departure, just before the meteor impact, with the clock showing 8:50 AM. The immediate aftermath sees him trying to warn his former colleagues about the impending disaster, highlighting the uncertainty of his situation and the potential for a drastically altered timeline.