The reviews highlight a consistent positive impression of Next Shikaku's oyster ramen offerings, praising their rich, umami-packed broths and authentic flavors. Customers appreciate the unique ambiance, which features a dark, modern design with digital art, creating an immersive dining experience. The ramen's broth, especially the slow-cooked oyster variants, garners high praise for its depth and seafood freshness, with some noting the noodles' texture as a minor area for improvement. Service quality varies, but many commend attentive and friendly staff. Overall, the establishment is recognized for its innovative dishes and authentic Japanese taste, making it a recommended spot for seafood and ramen enthusiasts.