the author said:
Last week my friend Gareth sent me a faulty “The Typing Of The Dead” NAOMI Cartridge

He said the cart was not working, in adition the cart arrived pretty destroyed (one of the connectors was totally destroyed), so i desoldered the Mask ROMS
After 8 hours of soldering (i still dont have a SOP44 socket) i dumped the 18 maskroms
Unfortunally one of the roms seems faulty (i tried to redump it 4 times (desoldering it and soldering it again) and allways got the same crc)

Anyways the game works pretty well at Makaron emulator, so i had a look into the damaged rom and noticed that only sound that was there.

So IC15 needs to be redumped