The former Moji Mitsui Club is a Western-style building that symbolizes the retro Mojiko style and was built as a social club for Mitsui & Co. Currently, it is used as a restaurant and a memorial room, and still conveys the afterglow of the port romance that flourished. The interior of the main building is centered around a hall on the first floor, with a dining room, reception room, and guest rooms. The second floor has living room, bedrooms and bathrooms.The interior of the main building is gracefully decorated in Art Deco style with geometric patterns, stained glass and mosaic style found in door frames, window frames, and the main pillar of the grand staircase. The second floor is a paid exhibition space for the Einstein Memorial Room and the Fumiko Hayashi Memorial Room, a female writer from Moji.