I need some help for Gratuitous Self 7.

What do you call that guy who comes out (in a jogging outfit) and calls in
the latecomers in the Japanese schools? No, I don't need the Japanese term.
I just want to make something clear.

Is he the truant officer? Is he the vice-principal? Is he something else?
The gym teacher, perhaps?

Thanks for the help.

TimeRunner
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http://www.geocities.com/Tokyo/Towers/7482