Underwater Love 2011

The story is equally simple and strange. Asuka (Sawa Masaki) works in a fish factory and is planning her wedding to the plant manager . While her younger coworkers tease her for being an old woman (of maybe 30 something) she appears mostly content. Her world is shaken upon meeting her drowned high school classmate Aoiki (Yoshirô Umezawa) who has returned to life as a kappa. He has returned for a reason. Maybe it's not to get it on with her coworkers, but he doesn't let that opportunity slide when it presents itself nonetheless. Not to give too much away, he's back to try and save Asuka's life - which he proceeds to do in a low key, occasionally musical way.