Final answer:
Hiroshi's family makes fish for dinner when he invites Kiko and Jamie. Fish is a staple source of protein in Japan and is chosen due to its availability and relatively lower cost compared to beef.
Step-by-step explanation:
When Hiroshi invites Kiko and Jamie to dinner, his family makes fish as a staple source of protein. In Japan, fish is often consumed due to its availability and relatively lower cost compared to beef, which is at a premium price.
This dietary choice reflects the fact that all the oil and about 60 percent of the food products in Japan have to be imported. Additionally, the cost of living in places like Tokyo is high, making fish a more economical choice.