(Speculation) 2nd Season, Vols 5 - 9

This is when the finally help Haru to split the Disaster back into The Destiny and The Star Caster, lifting the Chrome Disaster curse from Accel World.

If you think about it, is not impossible to get that far
this season covered Vol 1, 2, 3, 4 and 80% of 10 (vol 10 are 3 side stories: 1) the Body guard, is the time haru lvl up to 2 and had to use the help of Aqua current, 2) the trip of HYK to Okinawa, 3) A fight between Crow and Kirito) so that makes 4 + 2/3 vols in 24 episodes.

If they make season 3, 26 episodes, it will be more than enough to cover all from 5 - 9: The space race, Haru turning into Chrome Disaster, Raker getting back her legs, the ISS parasite on Taku, the fight between Lotus and Crow, The 1st King summit, the Betrayal of Black Vise, the introduction or Ardon Maiden, The "trip" to the Royal Palace, Blossom and Falcon 7000 years old story, Crow in Chrome Disaster vs Green Grande and Iron Pound, the Rescue of Ardon Maiden. The split and seal of the Disaster Armor