From Exit 1.
Exit number 1 looks like this:
The black arrow is oriented in the direction you'll come out with.
As you reach the surface, the part of the campus you're interested in develops at your right hand side.
You have to reach us at the Graduate School of Information Science (GSIS, or "Johokagaku" in Japanese), or at the Graduate School of Languages and Cultures (GSLC).
In the map above, Exit 1 is circled in red, while GSIS is indicated with number 42 and is circled in blue. GSLC is also in the blue circle, number 46.