Koukou Hikari is a Japanese restaurant in Seoul run by Japanese staff, serving ramen, soba sets, and sushi. At lunch it offers chicken mayo rice bowls, beef rice bowls, tonkotsu ramen, and salmon rice bowls, while the soba set comes with Japanese soba noodles and sushi. The menu is not fixed and changes with the day's ingredients, and dishes can be ordered in small plates. The space is small, so it is hard to seat many customers at lunch, and there are outdoor seats.