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Tetsujin Holdings, Inc. engages in the management of karaoke rooms. It operates through the following segments: Karaoke Room Management, Food and Beverage, Beauty, and Media and Content Planning. The Karaoke Room Management segment operates karaoke shops under the name Karaoke no Tetsujin. The Food and Beverage segment operates a ramen business under the Naohisa brand and sells to directly managed stores, franchisee stores, retail distribution companies, etc. The Beauty segment operates eyelash extension and nail salons under the Bianca brand. The Media and Content Planning segment engages in the production, sale, and distribution of mobile content for mobile phones. The company was founded on December 14, 1999 and is headquartered in Tokyo, Japan.