Boku no Natsuyasumi (ぼくのなつやすみ, lit. “My Summer Vacation”) is a video game developed by Millennium Kitchen and published by Sony Computer Entertainment for the PlayStation. It is part of the popular Boku no Natsuyasumi series and was released in Japan on June 22, 2000. A PlayStation Portable port was released on June 27, 2006 Boku no Natsuyasumi Portable: Mushimushi Hakase to Teppen-yama no Himitsu!!, “My Summer Vacation Portable: the Secret of Dr. Steamy and the Summit Mountain!!”. The port features updated graphics and several new characters.