Trance is a state of lessened consciousness, euphoria and meditation. Don't give me that look, that's the definition, alright? For some, this course of events is inspired by music. It's always been a well-represented genre in the Vocaloid scene, moreover since Vocaloid fits it to a T. That's why tracks 1 through 3 will, I daresay, take you higher (as goes that infamous sample).
Last but not least there's track 4, a witch house gem, unlike anything I'd heard before in my days with Vocaloid. Deep cuts all up in this EP.