It starts with the protagonist, Mukouda, who gets summoned to another world by a hero summoning ritual that totally screws him over—no OP combat skills, just 'Online Supermarket,' which lets him order stuff from modern-day Japan. That's the whole 'Tondemo Skill' part. He's kind of ordinary but decent, and his main goal is just to survive and eat well, which I find super relatable. He's not out to save the world; he just wants a hot meal.
Then there's Fenrir, the wolf. Well, a Fenrir. He's the first and most iconic familiar Mukouda contracts with. Starts off as this terrifying, legendary beast, but Mukouda tames him with food—specifically, a giant slab of high-quality meat from his skill. Fenrir becomes this ridiculously powerful, fiercely loyal, and kinda gluttonous bodyguard. Their dynamic is hilarious because Fenrir is absurdly strong but totally motivated by the promise of more delicious treats.
You also have Sui, the slime. It's an evolution-type slime Mukouda picks up, and it's adorable. It starts as this cute little blue blob but evolves into a 'King Slime' and then an even more advanced form. Sui is incredibly useful for cleaning and material processing, but it's also another foodie obsessed with Mukouda's cooking. The party is basically a guy and his two overpowered, food-motivated monsters traveling and eating their way through the fantasy world. Later on, a few more familiar-type creatures join, but the core trio for most of the early story is definitely Mukouda, Fenrir, and Sui.