[Serious requests gets an eyeroll from the older teen - ah yes, they only take serious requests at their very serious ghost hunting business, pffff - but at least with their height difference and the fact he's facing forward, Mai is mostly out of view.]

There's a distinct possibility, but I'd say that we don't have to assume a thing. We can discover the truth with a few simple questions.

[the power of deduction~]

What was the date when you left?