It was Marisa, with the hakkero, in the SDM. Case closed.
And that someone is you, Kirisame Marisa!!It certainly couldn't have been me who lost it, so...What!!Yes! Someone must have stolen it!!The problem is...So you tied me up right away, huh.Furthermore it wasn't because I was careless and misplaced it...So it must have been an outsider who broke in and stole it!The watch disappeared in the mansion...