you're insane
[There really isn't a set time for Kazuki to both go to 'work' and to return. Not that he always spends that time at the dive. To come home to Soushi napping isn't extremely rare or anything, either.
Although this is definitely a first.
Even before anything else - even if he's not paying much attention (to start. . .) to how it definitely is one of his shirts - there's one reaction Kazuki finds himself unable to contain.
So insert a bout of snickering right here. At least (hopefully) on the quiet side.]