Mafia 95. The Wardens' campaign against Urubaen.

I would politely ask the GM. Or, at worst, I would stay in the game but do nothing, neither during the day nor at night.

If you're a mafia member, your team can do everything for you at night ;)

Added 8 minutes later
Okay, let's not go against logic. Execute Tenshi.

I still think it was a mega-underhanded move, but I'll express my opinion after the game. And if Tenshi turns out to be a town member, which I want to believe (even if it's a miracle), then Kosha is a double loser, let her get modkilled.