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@Ryuken_san I see. O-toro is the name of the belly of the tuna. It is expensive because not that much can be taken from one tuna. On the other hand, it contains a lot of fat and has a rich flavor, so I think it tastes better when eaten alone, not combined with other food items.
Akami is the meat in the center of the tuna. Unlike its appearance, it has less fat and is healthier. This may be the reason why it is often used in French dishes.