As usual, Jururu, an ordinary high school student, was returning home from school. However, she suddenly finds herself in a life-threatening situation due to a sudden accident.

But at that moment, a mysterious girl appears and reverses time, saving her life. The girl tells Jururu that similar events will continue to happen in the future and reveals the only way for her to survive.

That is to help the current version of herself, Gosegu, achieve what she desires. Reluctantly agreeing to listen to her in order to stay alive, Jururu welcomes her, who transfers to her class the next day. However, Segu unexpectedly presents a proposition to her.

"Why don't you become an idol with me?!"
"What are you talking about, Segu...?"

Will Jururu truly be able to help Gosegu become an idol and overcome her own death?