Chuuhai Lemon: Love 30s - Ame ni Nurete mo

Bug-eyed Katsumi (known as Chuhai to his friends) is a muscle-bound detective determined to use his strength and pig-headed stupidity to rescue his teenage girlfriend from a succession of embarrassing situations. Based on a manga by Sho Fumimura and heavily seeded with background music from the 1960s U.S. hit parade. (Source: The Anime Encyclopedia)