Ichiran Shibuya ★ 4.0
Ichiran in Tokyo's Shibuya runs 24-hour tonkotsu ramen for under 1,500 yen including a kaedama refill. Vending machine ticketing, solo-booth seating.
Try: Tonkotsu ramen with customisation slip
Tip: Late-night cheaper than peak hours. Pay at the machine; the slip lets you set spice, broth richness, noodle firmness.