Off Course（オフコース） had a 20-year-long run from 1969-1989 as a popular pop/folk/rock band from Yokohama. "Aki no Kehai"was released as a single in August 1977 before coming out as part of the album "JUNKTION" a month later.
According to an interview with Oda himself, part of which was re-written onto J-Wiki, the lyrics talk of a man sadly having to part with his girlfriend at her favorite park in Yokohama. Oda had initially felt that the protagonist was splitting up with her in such a gallant and tender way, as in a movie, but after thinking about it, he came to the conclusion that the guy was a bit of a bastard although that hadn't been Oda's intention!
In any case, it's just lovely to listen to...although perhaps you should think twice before playing it at your wedding.