User blog comment:Dragonjet/KC3改/@comment-112.200.72.41-20160327065746/@comment-1820055-20160327132521

yep, we only partially support seasonal lines at the moment, but not because of technical issues. it is totally possible but we already have a big enough problem of not having enough man power to do just the checking if normal voice lines.

right now mutsuki and kisaragi have their seasonal lines specified.