Boku no Natsuyasumi 4

Boku no Natsuyasumi 4 (ぼくのなつやすみ4, lit. "My Summer Vacation 4: Boy’s Inland Detective Club, Me and the Secret Map") is a video game developed by Millennium Kitchen and published by Sony Computer Entertainment for the PlayStation Portable. It is part of the popular Boku no Natsuyasumi series and was released in Japan on July 2, 2009. Like Boku no Natsuyasumi 2, it takes place in a Japanese coastal village.