Kaisen is an izakaya in Nakagyo Ward, Kyoto, serving seafood and sake. The menu includes crab croquettes, grilled beans, hoe over rice, and oysters, along with a wide selection of Japanese sake and soju. There is a record of a visit at 9:30 PM on a Sunday, and the venue closes at midnight, so staff give advance notice to customers arriving after 10:30 PM. Foreign customers have been refused entry even when time remained before closing.