Gaba Corporation | 6,560 followers on LinkedIn. 1-to-1 English language instruction for professionals in urban Japan | Recruiting NOW for Instructors to teach English to adult students 1-to-1 in Japan - check our site for more information on current openings. Gaba is Japan's leading provider of one-to-one English lessons. Our approach to teaching has always been one-to-one because we believe it is the most effective and rewarding way to both teach and learn the English language.