One day, Tsuyoshi Mukohda, an extremely ordinary salaryman, gets caught up in a hero summons being performed in another world. At the time of his summoning, he receives a unique skill known as "Online Grocery", that allows him to bring food ingredients and seasonings from his original world. Even though this skill seems plain at first glance, the food he brings into this new world has an absurd effect...!?

After Mukohda rescues a traveling caravan from a band of bandits, they set out together for the great city of Karelina. But when Mukohda visits the Adventurer’s Guild in the city, he gets notified that his membership was revoked...?

Lambert consults Mukohda about a gift for his wife. When Mukohda suggests a certain product he purchased from the online grocery, it leads to an unexpected situation. Meanwhile, a pack of dangerous monsters, called wyverns, are approaching the town...?