Hyakki Yakoo is a five-reel, payline slot from Vela. LeoVegas AB is a Swedish mobile gaming company and provider of online casino and sports betting services such as table games, video slots. . Hyakki Yakoo is a five-reel, payline slot from Vela. PLAY LEOVEGAS ONLINE CASINO GAMES SUCH AS SLOTS, BLACKJACK, ROULETTE, POKER & MORE! A welcome bonus of UP TO £ and 50 FREE SPINS is waiting for you when. LeoVegas online casino has launched its own online slots game - LeoVegas Megaways! Hyakki Yakoo Slot. LeoVegas online casino has launched its own online slots game - LeoVegas Megaways! Hyakki Yakoo Slot. LeoVegas is an enterprise organization specializing in gaming, online casinos, and sports betting, with more than 1, employees of multiple sub-companies.