Keita Ai , better known as Fuudo (ふ〜ど), is a Japanese electronic sports player specializing in the Street Fighter series. Fuudo entered the fighting game scene in 2005 playing Virtua Fighter 4. Fuudo has won various fighting game tournaments, including the World Cyber Games and Evolution Championship Series. Fuudo has been described by multiple journalists as the world's best R. Mika player.

Tougeki - Super Battle Opera (SBO), also known as the Arcadia Cup Tournament was an annual Japanese fighting video game tournament hosted by the magazine Arcadia. Several games are represented at a single year's tournament, with the lineup changing every year. Which games are to be represented are decided by the organizers of the event. It was considered one of the two most prestigious fighting game tournaments, along with the Evolution Championship Series. It was suspended indefinitely in 2012.