Read through the raws, had to stop and drop the series at 18.3 due to the fact that the MC immediately begins proselytizing his love for rice.
What makes this even more insane is that in Ch. 4.1 the MC said that he liked the cafe because they had unlimited rice. So we go from, "I can eat as many cups of rice as I want" to "there's rice!? - You know about it!?".
The Japanese like to use European settings for their isekai works, but then make them rice-less worlds, seemingly unaware that Europeans grew and ate rice, especially in Italian and Spanish cuisine. But many Japanese seem to be aware of risotto and paella. They know where these come from, right? In fact, my family meals often used rice. I didn't even really think about it until writing this. Every American knows about Uncle Ben's, but that's not what we used. It was a bag of white rice. Maybe Parish or Carolina brand?
Similar to Japan, in Europe, rice was rich people food, and rice only recently became a staple crop in Japan. Japanese and Chinese used to survive on barley, millet, and wheat, and on non-grains like soybeans and buckwheat. More than that, while many people associate American slavery with cotton, it was actually the rice industry that started it.
While the Japanese could be largely ignorant of global cuizine and their own dietary history, I think this is actually the Japanese rice lobby at work. I have seen the same nonsequitor in other works, where the MC had rice and then the great rice hunt. There are also some titles where the manga or anime had rice hunts while the WN/LN had none.