I remember the ship in it was Kirito x Asuna x, Sinon, Kirito and Sinon became friends during the beta and they also go to the same school, they met Asuna in the game. In the last chapter, they just beat a Buddhist theme floor boss, I can't remember if it was a Buddha statue or just something related to Buddhism. Also in one of the chapters Sinon and Asuna got some cloth's from a frog boss I think and Kirito was forced to become a dress-up doll afterward.