This is "Bubble Kund 1999" for the NEC PC-6001mkII. It supports machine language and was produced by Hudson. The box is included, but the manual is not (I'm not sure if it originally came with one). It was found while cleaning up my parents' house. I have not checked it recently to confirm that it works, but I was told that it worked fine previously. The tape does not appear to have any mold or damage, so I think it should be okay. However, considering its age, I am selling it as junk in its current condition. I am not very knowledgeable about this, so I may not be able to answer any questions. I am also selling other software, so please take a look.