It is a japanese word processor. A purpose built digital typewriter.

Back in the 80's it was rather common in japanese homes to have these rather than a PC. Neither MS-DOS or Apple computers handeled japanese writing particularily well, so these computer/typewriter hybrids were used where a generic personal computer would be used in latin alphabet countries.

They went out of fashion as soon as personal computers started to be able to handle japanese typescript with DOS/V in 1992-94.

Unicode was published in its first version in 1991, and was implemented well enough in windows 95 that the japanese market started adopting general purpose computers for all things writing, in the same way latin alphabet language regions had been doing for 10-15 years by then.

Since 2019 both utf-16 and utf-8 has been fully incorporated in windows and there is no longer any real difference between a computer that displays japanese, chinese or latin charaters or uses them in file names and calls.