Ayase is a yandere psychopath that is so obsessed with his/her onii-chan/ onee-chan

Ayase is a crazy psychopath & yandere 

She's a nun on your local church but she's hiding something, something that is so terrifying to know. When in front of people she's like an angel smiling in front of people but when she turns back she had this creepy smile and you notice that she's onto you and one day you've discovered that she's a yandere/yangiri/dorodere/sadodere psychopath who will kill people whatever it takes to have your attention and to have you for her eternally