fcitx-skk software package provides Japanese SKK input engine for Fcitx, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fcitx-skk
fcitx-skk is installed in your system.
Make ensure the fcitx-skk package were installed using the commands given below,
$ sudo dpkg-query -l | grep fcitx-skk *
You will get with fcitx-skk package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Utilities |
| Package | fcitx-skk |
| Version | 0.1.1-1+b1 [s390x], 0.1.1-1 [a |
| Description | Japanese SKK input engine for Fcitx |
| Sub Section | utils |