Rabukome to Kaijuu Taiji no Fumonritsu

Tsubura Enjo, a high school girl with a shy and timid personality, has two close connections in her life: her childhood friend Anna and her classmate Sho, who is a big fan of special effects (tokusatsu) films.

One day, while exploring her late grandfather's storage room, she discovers an old ring. When she puts it on, she is suddenly transported 50 years into the past, right into the middle of a scene with a giant monster! To her shock, she finds herself on the set of a tokusatsu film, directed by her grandfather in his youth.

Overwhelmed and scared, she is instructed by her young grandfather to help defeat the monster, leading to a tearful yet courageous battle against the giant creature!