The filming process was assisted by the Japanese Ground Self-Defense Force and the Air Self-Defense Force. According to statistics, more than 1 10,000 bullets were fired in the whole film.

The originality of the library series originated from the Declaration of Freedom of the Library (promulgated at 1954) discovered by Hiro Arikawa's husband.

The normalization of titles in the film was one of the alternative titles when Emperor Akihito ascended the throne, besides the present Heisei title.

There is a scene in the shooting, where Rong Cang is doing a squat with a gun, and the devil instructor Okada is on the scene. After counting 1 1, I counted a few more 12, which made Rong Cang stand up as hard as she could, feeling like a newborn toddler.

During filming, Hiro Arikawa asked Eikura Nana for his autograph.