She is a mother,she tried to be a loving and sweet person for her son,but when he get captured by the baby,they send him back but tied him to a special bomb..she can only kill him to stop it from denonate,she  broke down seeing the corspe of her son..and now,she think it all her fault for this,she think she is a monster

A mother that had choose duty over her little one

Really like to hang out with yuki and aiki as they are childhood friends with yuu,yuu also highly respected his mother,though he is a little bit scared of her overprotectiveness