The story behind Return is that the main character, Tetsuya, received an order from his boss to nail down a drug dealer. Tetsuya and his girlfriend have once tried to catch the dealer in Los Angeles, but unfortunately failed the mission. This time they received information that the dealer has appeared in Hong Kong. With the companion of Tetsuya's old pal and ex-girlfriend, the four police took off from Japan and head toward Hong Kong for the dealer. During the flight, they encountered a strange occurrence. All of their watches displayed different time. Although they soon ignore the strange phenomenon, they will soon be drawn into the inescapable time traveling that is caused by such phenomenon. When the foursome arrived at Hong Kong and found the dealer's hideout, a gunfight between them has caused the strange phenomenon to occur. Soon after they were drawn into the black hole, they realized they are no long in 1995. Instead, they are back in 1941 where Japan controlled most countries in Asia. From here on, the foursome is on the journey to "return" to 1995.

[from Anime Densetsu]