It is a known fact that SAO has great music. To be fair, I find all openings to be amazing, so it was hard to make this ranking, but I hope you enjoy it!
4. “INNOCENCE” by Eir Aoi
It’s hard to rank openings when they’re all good. I put the others above this one because I felt that they have more emotion, but this opening has a lot of emotion in it too! The visuals are also very sweet, showing us the brother-sister relationship that Kirito and Suguha have.
3. “Crossing field” by LiSa
The very first opening of the anime. This opening is special because it reminds us all how it all started. The song is strong and the visuals show what the entire “death game” arc is about perfectly.
2. “Courage” by Haruka Tomatsu
This is second opening of SAO II, covering the Calibur and Mother Rosario arcs. However this opening was obviously made especially for the Mother Rosario arc. The singer is Asuna’s VA, and the title is “courage”, in Japanese that’s “yuuki”, which incidentally is the name for both Asuna and Yuuki. Can it be more obvious?
1. “IGNITE” by Eir Aoi
This is the first opening of SAO II, dedicated to the GGO arc. I chose this because the song resonates a lot of strength and it makes you feel the intensity of the arc. The visuals are also amazing and there’s actually a spoiler of what happens later in the arc, did you notice it?