Maya Aku, a demon seeking practical experience, has entered the mortal world. She is currently residing in a hostel and posing as a human student, keeping her demonic nature a secret from her close friends Sui, Sawa, and Arata. Maya's primary objective is to accumulate harmful human energy using her "evil checker" mobile device. However, she finds it challenging to derive satisfaction from this undertaking. Moreover, if her companions were to uncover her true identity, she fears their reaction.