Tsuchiya Yuki

About
The youngest of the three adopted by Tsuchiya Wakako. She is currently married out of convenience to Tsuchiya Kuon, but she is actually quite happy with it.

Her story is very similar to the other two. Her parents died in an accident and she got adopted by Tsuchiya Wakako on a whim. She saw potential in her and despite her young age she managed to keep up. Kuon and Sei treated her like a little sister, the latter more than the other, and tried to protect her from Wakako. She turned out to be a capable businesswoman and went along with the other two to start their business.

She has had feelings for Kuon since she was young, but she was very embarrassed and kept hiding behind the brotherly Sei. Both relationships have stayed the same from her point of view and her marriage, despite the circumstances, does make her happy. Her close relationship with Sei makes Kuon jealous even though he doesn't understand why.

Her route is about the relationship triangle of the three orphans. She has always loved Kuon more than a brother and saw Sei as a brother. Sei does seem to love her, but prioritizes both of them above himself. Kuon seems to misunderstand their conversations as a hint of an affair and mistreats them both.

They are made to engage in a threesome by Kuon which he intends to be a humiliating punishment. Yuki allows it for Kuon's sake and Sei does not go against it then. Later on Tsuchiya Sera is seen mutilating Yuki, at this point Sera can be stopped or not. If not, Yuki dies of her wounds which greatly upsets Sei who seems to leave. If Yuki is saved, she wonders why he did so as she knows how important Sera is to him and he wonders the same. Later on they reconcile as Yuki explains her true feelings and Kuon realizes his misunderstanding.

Her endings with Kuon either see her grow old with him, get frozen/sleep with him or have her raise his child after his death. She believes the child to be a reincarnation and gives him the same name.