Welcome to the culinary haven known as Negishi Kikusui Building, nestled in the vibrant heart of Shinjuku City, Tokyo. This gem, located on the 2nd floor of the Kikusui Building, can be a bit elusive. Keep your eyes peeled for the illuminated signage as you ascend the staircase, a small hunt that sets the stage for a delightful dining experience.

Renowned as a specialist in gyutan, or beef tongue, Negishi Kikusui Building takes pride in serving not just quality, but an authentic taste of Tokyo. Diners rave about the charcoal flavor that permeates each tender piece, making every bite a revelation. Regular patrons, like Ray Hsu, laud it as the "best gyutan in Tokyo," praising not only the expertly grilled tongue but also the fantastic rice and soup that accompany it. For anyone venturing into Tokyo, this sentiment resonates—it's a must-visit.

This establishment embraces a true local vibe, attracting mostly Japanese clientele. It's a place where familiarity breeds satisfaction, as highlighted by Eugene Cheng's experience of indulging in the beef tongue set. Each set is a culinary ode, showcasing the power of simplicity—where quality ingredients meet expert preparation to create flavors that linger long after the meal is over.

For lunch lovers, Kevin Oetiker shares his experience of finding the perfect midday escape. With ample space just after noon, it serves as a wonderful break from the fast-paced atmosphere surrounding it, offering a diverse and value-driven menu.

While the ambiance might lean towards the simpler side, the focus here is undeniably on the food. If you’re passionate about exploring the nuances of ox tongue, Negishi Kikusui Building is an essential stop in your culinary journey through Tokyo. Prepare to be charmed—not only by the mouthwatering dishes but by the dedication to quality that has cemented this restaurant's place in the heart of food lovers.