Ep. 21: Asuna joins the healers and Yuuki defeats the boss before an emotional logout

During the raid, Kirito fights reinforcements while the Sleeping Knights struggle against blockers. Asuna takes over healing duties, using Flashing Penetrator to eliminate enemy healers and their leader, allowing the group to reach the boss room. Inside, Asuna identifies the boss's weakness and directs Yuuki to attack. Utilizing Tecchi as a platform, Yuuki defeats the boss with her Original Sword Skill. The group plans to celebrate at Asuna’s home, where she asks to join the Sleeping Knights, receiving negative reactions. They visit the Monument of Swordsmen for a photo. Yuuki accidentally calls Asuna her elder sister, a slip made earlier in the battle. When Asuna points this out, Yuuki begins crying and abruptly logs out.

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