One day, high-school student Koyomi Araragi catches a girl named Hitagi Senjougahara when she trips. But—much to his surprise—she doesn’t weigh anything. At all. She says an encounter with a so-called “crab” took away all her weight …
Monsters have been here since the beginning.
The only thing Mukouda can rely on is his unique skill: the "Online Supermarket," a skill that allows him to buy modern goods in a fantasy world. It's useless for combat, but if he plays his cards right, he could lead a comfortable life, maybe? At least, that's what Mukouda thinks, but it turns out modern food bought with this skill has some absurd effects! What happens when Mukouda introduces ridiculously tasty modern cooking to a fantasy world like this? He gets some ridiculous repeat customers begging for more...!