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 registering with both the Merchant's and the Adventurer's Guilds, Mukohda immediately decides to take on a beginner’s quest. However, when they deliver the monsters that Fel caught during their quest to the Guild, they find out that most of these monsters are B-rank or higher.

The place Fel decides to bring Mukohda to get some battle experience ends up being a creepy dungeon. Even so, Mukohda gets ready for battle and increases his stats by eating a meal from his original world using the “Online Grocery”. However...

Mukohda and his familiars receive a request to head towards a mine and hunt down the metal lizard that inhabits it. Instead, they run into a rare mithril lizard. After Mukohda defeats the lizard, with the help of Fel and Sui, Fel turns his interest towards a different and tastier prey...?

After easily defeating the pack of dangerous yet powerful wyverns, Mukohda and his familiars receive praise not only from the guild, but also from the entire town. Unfazed by the attention, Mukohda goes out to look for a certain thing that he's always wanted to get in ever since he got summoned to this world.