It's Tenchū Shinobi Gaisen (a Japanese version of Stealth Assassin). The text is not much compared to Fire Emblem or Final Fantasy I've translated. Almost of them is just image, but I can't locate the text when character encounters the boss.
For example, the 1st stage: It looks like you choose the wrong party to crash....
I'll be very grateful if anyone point out for me which file to look for these text.
Thank you very much