Harumama Ramen by Blue Ocean Sushi opened on Voltaire Street in August 2022 as the fifth location of the Harumama restaurant group, taking over the 2,450-square-foot former OB Garden Café space with a first-floor dining room, sidewalk patio, and rooftop deck. The signature draw is a rotating lineup of hand-crafted character buns — Winnie the Pooh, animal-shaped pandas, and seasonal limited-edition releases — built around the same Asian-fusion ramen-and-bun program that drove the Little Italy and Carlsbad rooms before this expansion, a different ramen format than the deeper Vietnamese-heavy menu at OB Noodle House & Sake Bar. The ramen lineup runs tonkotsu, miso, shoyu, and spicy varieties alongside small bites (gyoza, chicken karaage, takoyaki) and a Blue Ocean Sushi roll menu added to the OB build to bridge the parent group's sushi side. The bar pours imported sake, soju, and craft beer alongside ramen-friendly cocktails, a beverage program built around Asian spirits that contrasts with the wider Japanese-tapas-and-cocktail format at The Joint Sushi & Tapas. The rooftop deck functions as the property's most ambitious build — a second-story open-air dining space added during the 2022 conversion, designed to handle the Instagram-driven weekend traffic that comes with Harumama's social-media reputation for character-bun releases.