START-489 Yotsuba Kominato, a blonde gal controlled by a hypnotic ray.

Suzuki, a student preparing for university entrance exams, was leading a life of studying and part-time work, but his anger finally exploded after being constantly bothered by his neighbor Yotsuha both at home and at work. Using a hypnotic trap light he acquired, he begins his revenge against Yotsuha and her boyfriend Yota.