Tonfumi
Located just 1 minute on foot from Kagohara Station's north exit, this tonkatsu specialist uses 'Sai no Kuni' black pork raised at their own farm in Fukaya, Saitama. The black pork's finely marbled texture and sweet fat are the selling points, and at from 990 yen for a tonkatsu set, the value is overwhelming. Tabelog Kumagaya tonkatsu #1 (3.46/183 reviews). Hotpepper 4.1/331 reviews. Popular for lunch queues with locals at both midday and evening. Only 2 directly managed locations (Kagohara main and Kumagaya Higitsuka) — no franchise.
Reviews say 'Impossible value at 990 yen for farm-raised black pork', 'Crispy batter, tender meat', 'The only place in Kagohara with a queue at lunchtime'. Tabelog 183 and Hotpepper 4.1/331 reviews prove sustained popularity. TripAdvisor 4.0/16 also high-rated. Negative reviews only about 'waiting in crowds' and 'didn't know it was closed Mondays' — no fake review suspicion.