Keroro & Fuyuki: Night of the Time Capsule, Sir!

When Fuyuki and company go with Keroro to school at night to dig up a time capsule that accidentally contains a "super-secret item," a mysterious mist rolls in. As the gang is separated by the mist, they ruminate on what their lives will be like 20 years in the future, when the time capsule is officially slated to be opened.