The digital single "HOUSE PARTY/NEW WORLD" from Walkin'On Air will be released on June 10, the first time in about 4 months. This album contains two songs, "HOUSE PARTY", which is a different taste from Heartbeat's previous releases, and "NEW WORLD", which celebrates a bright future for the two of you who will be happy during the time of your June bride, with a positive feeling that you can overcome any situation. This work is produced by GP of the Gaki Ranger.