MTV announced the broadcast of a special program, "D-1: Tomorrow is H//PE Princess!", on May 26. The show features the 7-member girl group formed through a Japan-Korea audition, showcasing their off-stage life in a countryside house in Chiba just before their debut with the 1st mini-album "17.7" on May 27. An X (formerly Twitter) giveaway campaign for signed goods will also be held.