Unagi 4th Yondaime Kikukawa Tokyo Station Kurobei Yokocho Branch is an eel restaurant in Kurobei Yokocho on the basement first floor of Tokyo Station. It serves unagi donburi and other eel dishes, grilled Kansai-style so the skin is crisp and the inside is soft, with sauce and sansho pepper. Sansho comes as both powder and whole berries so diners can choose. Going at lunch without a reservation can mean waiting.