To prompt this, I'm looking to create a visual novel to be precise, and I was thinking about making the intro song and a few in-game songs with Teto. However, I don't know how to contact Twindrill about this, only that the usage policy I think says it's alright as long as it's not distasteful. I'm on the fence of whether or not it would be appropriate to sell the game with UTAU, and I am fine with distributing the game for free if it comes down to it or just not using her at all. The songs themselves would be free in either case of free or commercial distribution and posted on YouTube. If anyone could help me on this issue I'd very much appreciate it, and of course I'll answer questions or give specifics.