Karuizawa Syndrome
Genres: Comedy, Drama, Romance, Slice of Life
Type: OVA, Episodes: 1
Aired: Mar 21, 1986
Studio: Kitty Film Mitaka Studio
Source: Manga
Rating: R+ - Mild Nudity
Synopsis:
It  is an action comedy about a young man's persistent sexual fantasies. It has 4 distinct art styles: a manga style, a SD style, a realistic style, and a art-graphic pencil style.

(Source: technogirls.org)

Based on the manga by TAGAMI Yoshihisa (たがみ よしひさ) that serialised in Big Comic Spirits.