Hm, actually this demo ends on 15th February, so that shouldn't happen.
Did you do any particular thing the night before? (During my playtesting, I experience that too, but it happened so randomly I couldn't find the cause.)
I had the same thing happen to me on the 26 day of January too!
and when i exited out and tried to play again i ended up geting this error page :(
https://gyazo.com/46b5b11437c5381285981d582bd7b7ae
Did you download the extended demo?
(bcs the error page displays Seiyuu Danshi Demo 2.04 which is the previous version of the game)
