Touhou 12: Seirensen - Undefined Fantastic Object

There's an odd ship flying around up in the sky, and it's rumored to house treasure! Our girls eagerly fly off to investigate, as it's a win-win situation either way - either they get rich, or they discover and stop the scheme of whomever might be on board. For the first time in the series, new shrine maiden Sanae joins the quest, and it's become clear by now she becomes a regular.