Cefucom 21 is an educational, electro-mechanical multimedia computer from Japan, 1983. Or a “multipurpose SLAP computer”, as they call it. While it looks like a screen on the left, that is actually just transparent plastic. Inside, you put “capsules” with pages, and the computer controls which page is displayed. The cassette player is used for playing audio, and for data storage.
Cefucom seems to be based on Sanyo’s PHC-25 that has a 32×16 or 16×16 textmode, so you can have a big font to display Japanese characters decently.