For those hunting the ISO, you are looking for the original vision—the blueprint that started it all.
Head to the PCSX2 forums, download the Nightly build, acquire the BIOS via your own legal means (dumped from a personal PS2), and then search the Redump collection for the file matching the CRC32 provided above. Once emulated, prepare for one of the most charming, weird, and heartbreaking adventures of your life. Boku To Maou PS2 ISO -JPN-