The protagonist of the series, Kirito is a "solo" player and has been branded a beater (beta tester and cheater) by the players in Sword Art Online. His game alias is created by taking the syllables of the first and last Kanji of his real last and first names respectively: (Kirigaya Kazuto). When it is announced that the players of Sword Art Online can no longer log-out, he is distraught like everyone else, but quickly overcomes the shock. He power levels to improve his odds of survival in the game, quickly emerging as a frontline clearer of floors known as the Black Swordsman . In SAO, he is the sole possessor of a unique skill, «Dual Blades». During his time in SAO, he falls in love with a female player, Asuna, and even marries her in-game.