Climb to the top in the Sekai 2.0. Sekai means "World" in Japanese. This best selling BJJ gi from FUJI Sports was completely redesigned for the high-performance athlete in all of us. Excel to greatness with gear that will never fail you, even during the most rigorous training sessions and competitions. Sekai 2.0 - World Ranking. This lightweight gi design is built to last with triple reinforced ripstop pants and extra rows of stitching for a sturdier collar.