Kirigaya Suguha is raised with Kazuto as his sister since her parent took Kazuto in after his parents died in a traffic accident. Kazuto is Suguha's first cousin; his mother was Suguha's mother's sister. They were taught Kendo by their grandfather, who was a former policeman and a Kendo champion. Kazuto gave up after two years and embraced the world of technology, leaving her behind. The truth is, Kazuto found out he was not her real brother around this time and their distance became further and further apart, until they were practically strangers before the SAO Incident. She continued with Kendo and became a national quarter-finalist.
Suguha originally disliked VRMMOs for the reason it hid people's nature and reality. She took up ALO in order to understand Kazuto better when he was trapped in SAO. She won the Sylph tournament earning the title as strongest Sylph before Volume 3. She learned how to play ALO from her classmate, Recon. Suguha became very good at ALO because all the years, she have practiced Kendo for many years and the skills learned there were very effective for fights in ALO. She enjoys flying in the game, Recon nicknamed her "Speed Holic" due to her joy of flying.Tutorial:Finished: