Kajiwara Mariko, a manhater and the granddaughter of Kitagawa Johnny of J.E. was forced to be the FAKE assistant of Hey! Say! JUMP while the original assistant on leave for physical therapy. She never liked the fact that she'll be the FAKE assistant but she felt hurt when she found out that the original assistant needs money for her physical therapy and she agreed to take the job.

Will she fall in love with one of the members?

Will the people in J.E. know she's not the real one?

Will she stop from being a manhater?