for your orienting pleasure

here's Sophia (上智大学). it's pretty compact, which is convenient:

I live in Minami-Yono (南与野) which is in the upper left part of the of map, next to the purple blob. Sophia's at the Yotsuya station, which aslo has a purple blob marked next to it (I tried to do a star, but using Paint with any skill is sadly beyond my capabilities)

this is just one tiny part of the greater Tokyo train/subway system, though. there are also like twenty different lines owned by just as many companies involved in this colorful matrix of commuter fun.