Kikyû kurabu, sonogo

Murakami and his girlfriend Mitsuko start a hot air balloon club, which attracts several members, each having their own reasons to join. However, the club doesn't last long and is quickly disbanded. 5 years later, each of the members receive notice that Murakami has died in a traffic accident. This prompts them to once again gather together to throw a party in Murakami's honor. (movie.goo.ne.jp (Translated))