It's a trek from Osaka, but this place is unforgettable. Recommended for a night outside the city https://www.japan.travel/en/spot/977/

What to eat: ramen, soba, udon, gyudon, tempura, sushi, izakaya, yakiniku, yakitori

7-11: rice balls, nana-chiki

Tonkatsu at Tonkatsu Maisen Aoyama. Wagyu burger at Shonan Burger Shibuya. High-end tempura at Tenichi Ginza.