Kagami Sayo

About
Sayo (renameable) is a young girl sent to Tsuchiya Kuon as a tribute by her grandfather so he stops his department store.

She is the accidental daughter to a notoriously lecherous daughter of the chairman and thus unwanted. They hoped to get rid of her and not get crushed by Kuon's new store. Her mother has no interest in her, but her father seems to care greatly. She even calls for him specifically.

She is obtained by doing the department store jobs. Her route then splits into taking care of her yourself or letting Sera handle it. She can be sent back, but this does not give any ending.

If you do so yourself, she will mostly be confined to her room. Everyone around her tries to cheer her up a bit, but she has a hard time fitting in. Kuon then decides to fully adopt her and seriously care for her. She comes to like him and starts to speak with him.

In the Sera route she is put in the same room as her. Sera is told to be gentle and nice with her and she does so. The three quickly form a great bond, although Sera gets a bit jealous sometimes. Kuon can then decide to fully become a family with the three of them. They move to Switzerland and slowly live their lives in leisure.

She also has her own class change route where you actually play as her. It follows the plot where Kuon takes care of her. She gets used to living there, but the room is boring. She goes out to happily explore until she runs into Anzai Ayaka dragging Michel along. She spies on them and sees Ayaka mess with him. She is noticed and invited to enter which she does. She looks on in confusion how Michel is brought to climax and gets afraid. She runs back to her room and figures it is safer to sit there until she is allowed to leave.