REBORN!: HERE COMES A VONGOLA FAMILY-STYLE SCHOOL TRIP!

Initially an internet-only stand-alone special episode of Katekyo Hitman Reborn! shown on the Shounen-Jump website, where the main characters go to various tourist spots in Japan. It was made available later on DVD in July 2010, adding extra scenes. — Description from AniList community (anilist.co).