Nathan, Mark (falling asleep trying to read a math paper) and Paul in Mitsuhiro's office (Muroran, Japan):

Mark, Mitsuhiro, Paul and Nathan in Mitsuhiro's office

Mark, Mitsuhiro, Paul and Nathan; the helmet is for snow ball fight competition.

"mystery student", Mark, Nathan, and Paul in Mitsuhiro's lab.

Mark, Mitsuhiro, Yutaka, Nathan, Paul and many more in party that is totally out of control!