Maguroya Kurogin is a very popular corner shop in Tsukiji Market, Tokyo, Japan that specializes in bluefin tuna. They offer chuutoro, otoro and the very rare kama-toro (neck meat). It was incredibly fatty and tender, but it does get too sickening if you order too much. The queue is about 45 mins long at around 10am. They have a really fast system that allows you to dine in.