Hamaya
Established 1982, a Chatan soba institution near Miyagi Beach. Signature double-broth (bonito + pork bone) is perfectly balanced — not too strong, not too light — pleasing everyone from children to adults. The melt-in-your-mouth cartilage soki and tebichi are the headlining toppings; many reviews say 'I've never found soki this tender anywhere else.' TripAdvisor 4.3 (330 reviews, Chatan #1), Tabelog 3.54 (1,321 reviews). 90-seat venue mixing locals, divers, and tourists. Also sells soba via mail order.
Reviews: 'The flavor unchanged for 40+ years,' 'The melt-in-your-mouth soki is moving,' 'Everyone from kids to adults can enjoy this,' 'You can tell locals come every week,' 'Worth queuing for.' TripAdvisor 4.3 (Chatan #1), Tabelog 3.54 (1,321 reviews).