Selka Zuberg

Selka (セルカ) is an apprentice to Sister Azariya and is Alice's sister. She is capable of using sacred arts and lives at the church with the other orphans. She dislikes how she is constantly compared to her sister Alice. She takes care of Kirito upon his return to the Underworld.

Background
Selka moved into the church when she was 12 and she started studying the Sacred Arts all day. This is because she felt that she had to fill in Alice's place after she was taken away, but no matter how hard she tried Selka couldn't match Alice's ability. Ever since Selka moved into the church she had never once went back to her parents house. Although she is of similar age to all the orphans living in the church she takes care of them and helps with worship and meals.

Alicization Beginning
Selka Selka shows Kirito around the church and also shows him to the guest room where he would be sleeping. She confirms that he knows how to use the lamp before leaving. The next day Selka wakes Kirito up, saying he would be late for worship if he didn't. Selka is surprised when Kirito starts taking off his shirt to get changed so she quickly tells him to wash his face before leaving the room.

That night, when Selka goes to go check the bath but Kirito is using it so she asks him to unplug the stopper and turn off the lamp when he finishes. Before Selka leaves Kirito says that he wants to ask her something; so she tells him that she wait in his room as the people in her room are sleeping.

When Kirito enters the room Selka hands him a glass of liquid that he thinks is nectar. Selka tells him that it is an elixir made by priests that could recover any life lost due to illness or injuries. Selka them tells him that it is forbidden for her to enter a boy's room after bathing but since this is a guest room it doesn't count, although Sister Azariya would still scold her if she finds out. Kirito then apologises then says he wants to hear about her sister. Selka starts trembling but says she doesn't have an older sister. Kirito then tells her that Eugeo told him about Alice. They go on to talk and Selka explains how everyone seems to have forgotten about Alice and how Eugeo never smiles anymore. She then says she keeps being compared to Alice, but she can't even remember what her sister looked like. When the bell tower rings 9 o'clock Selka gets up and started walking to the door, but she turns around and asks if Kirito knew why Alice was taken away. Kirito explains to her about how Alice touched the Land of Darkness before Selka leaves.