Boku No Natsuyasumi Portable - Mushi Mushi Hakase To Teppen-yama No Himitsu ROM Download for Playstation Portable (PSP). Boku No Natsuyasumi Portable - Mushi Mushi Hakase To Teppen-yama No Himitsu game is available to play online and download only on Roms Games. Boku No Natsuyasumi Portable - Mushi Mushi Hakase To Teppen-yama No Himitsu ROM for Playstation Portable download requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.