Tsuyoshi Shikkari Shinasai: Tsuyoshi no Time Machine de Shikkari Shinasai
Japanese title: ツヨシしっかりしなさい ツヨシのタイムマシーンでしっかりしなさい
Type: Movie
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Dec 5, 1993
Duration: 30 min
Rating: PG-13 - Teens 13 or older
Genres: Comedy, Drama, Romance
Themes: School
Demographics: Seinen

Tsuyoshi and his perverted friend Tsukasa stumble upon a time machine while running away from Tsukasa's little sister. Along with the time machine's inventor they accidentally travel 12 years to the past and meet their younger selves along with Tsuyoshi's sister who back then wasn't a violent tomboy like nowadays.

(Source: MaouNemesis)