Fukuyama Gekijou: Natsu no Himitsu
Genres: Fantasy
Type: OVA, Episodes: 1
Aired: Sep 27, 1990
Studio: Mook Animation, Urban Product
Source: 4-koma manga
Rating: G - All Ages
Synopsis:
Several short animated mini-stories based on the short stories and four-panel manga of Keiko Fukuyama, including My Father the Mouse, The Rabbit Brothers, Summer Secret, The Mysterious Fairy, How Very Strange, and Kuro. 

(Source: Anime Encyclopedia)