as for japanese , i use ibus-anthy & jwm . (& roxterm)
about the reason of jwm , please look at http://openbsd-akita.blogspot.jp/2015/04/56-57-snapshot.html the icon(right under) show ether japaese anthy state or english state click the icon , then the state can be changed . ----- how to use ius-anthy is in http://openbsd-akita.blogspot.jp/2014/06/openbsd-nat-box-x.html