Anri Mihama

Struggling high schooler Miyui Mashio is transported back to 1991, where she attends school with her quarreling parents—realizing she must form an idol group with her mother to help her parents fall in love, or risk never being born.

The movie was inspired by Hiroshima prefectural government's marital activity "Koinowa Project" which is practiced as part of countermeasures against the declining birthplace.