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Sword Art Online
The story of Sword Art Online follows the adventures of Kazuto "Kirito" Kirigaya and Asuna Yuuki, two players who are trapped in the virtual world of "Sword Art Online" (SAO). They are tasked to clear all 100 Floors and defeat the final boss in order to be freed from the game. (from Wikipedia)

Kirito is the protagonist of Sword Art Online. His real name is Kazuto Kirigaya, but he is known by a portmanteau of his name, Kirito, which is his user name in the Sword Art Online video game which the series is partially set in. Kirito is a teenager who was chosen as one of 1,000 beta testers for a new virtual reality video game: Sword Art Online. After the game is released to the general public, he and the rest of the 10,000 players discover that they are unable to log out and are trapped in the simulation unless they manage to beat the game. (from Wikipedia)

Asuna Yuuki is a fictional character who appears in the Sword Art Online series of light novels by Reki Kawahara. She is mononymously more commonly known as just Asuna, her player name in the eponymous video game which the series is set in. Asuna appears as the lover of Kirito, as well as the female lead. (from Wikipedia)