Sotomura speaks really unnaturally, if only to perpetuate the gag of the manga. I mean who the hell speaks like that? (page 9 right side) H-"What do you do on rainy days?" S-"Since I can't go outside, I pretty much spend my free time just stringing them up." does that sound like the kind of sentence anyone would say normally? Stringing what up, rainy days? you are missing the subject of your sentence entirely, this is shit you should have learned in pre-k or elementary, it's the most basic fundament of speech universally.