"A girl in a lower grade just made me cry!" One day, Senpai visits the library after school and becomes the target of a super sadistic junior! The name of the girl who teases, torments, and tantalizes Senpai is "Nagatoro!" She's annoying yet adorable. It's painful, but you still want to be by her side. This is a story about an extremely sadistic and temperamental girl and you'll feel something awaken inside of you.

The concluding film to the Gintama animated series, adapting the final chapters of the comic series of the same name by Hideaki Sorachi. The film covers chapters 699–704 of the original comics, with original material added in.