Oh, that's weird... One line of dialogue in Itadaki Street 2 has a character that seems corrupt. Specifically, it tries loading a 1bpp 12x12 character from $8B:4DC9, which is way out in RAM...
I don't know if this address has any valid data when/if this text is normally loaded in-game, but no other text uses this value or any similar value, and any other text that uses a variable from RAM uses a control code and has special handling for it.