Kyocera Pocket Cosmo (Elate OS) - any knowledge?

Hello! I bought a boxed Kyocera DS-HN1 PDA for my collection, also called Pocket Cosmo.

It seems that it was released only in Japan in 2002. The PDA has its own OS, called Elate OS. They write that it`s based on Java. Some info in Japanese: https://allabout.co.jp/gm/gc/81325/

I`m interested if anyone knows something about this OS? Any software, games, tips, tricks? I don`t know Japanese, but the only thing I can find is Notepad. Also Settings and File manager. Tried to put a CF with MP3 and TXT files in it - no luck, only some errors appear on the screen.

Photo of the device. It has JogDial, and the interface has many animated effects.

According to the site below, ADK (Application Development Kit) was distributed with limited number of 3000. Neat device. I've seen it for the first time.

http://www.wince.ne.jp/snap/ceSnapView.asp?PID=874

Thanks, Stingraze, interesting link! It seems that it is like "stillborn baby" without further development? Nice...

Also curious - Japanese probably loved that form-factor? Because Hitachi NPD-10JWL, also Japanese market only (and I have it in my collection ) has the same design - also JogDial, same form factor and size, but... Win CE.NET on board

https://www.hitachi.co.jp/New/cnews/2002/0219/index.html

I read about the HITACHI NPD-10JWL long ago in MOBILE PRESS (a Japanese PDA magazine).
I remember it had Windows CE .NET 4.x on it. I saw it being on Yahoo Auction one time...