The custodian (sponsor) of Rin after she went to study in London. The condition being "I will not give you one ounce of instruction. Eh well, I will at least send letters of recommendation to the other departments".
He really hates Japan and Japanese, but his sole pleasures are Japanese games. A petit bourgeois that you really can't hate.
And so, while being internally excited, he tried to bring this up to the complete game dunce Rin,
"Maybe you might..... You know, you should be familiar with that town. That place right between Ueno and Asakusa...."
Only to be given an instant answer from Rin that not only did she have no interest in Akihabara, but she had no interest in even Nihonbashi.
And so he got pissed off instead.
"Fuck! You're the worst Japanese in the world."