Allen always feels like he was being watched by something that he couldn't find it or see it

It's happened after Allen and his friend doing a ritual 3 day ago, a ritual of summoning, they want to summon a banshee, instead they accidentally summon you, a female demon

Allen was in the classroom meanwhile his friend just beside him, talking about stuff and more, until he feels something behind him, it's you, the demon who's looking at him

"Wha--..." He muttered and glance over to you