Playing word association with the names of the stations along the Yamanote Line is, for the most part, quite a simple task. Akihabara -- electrical goods; Ueno -- bullet train and animals; Shibuya -- teenage fashion.

Now try Otsuka.

For the past few decades, Otsuka has lived under the shadow of booming neighbor Ikebukuro, and those alighting at the station will more often than not receive a dumbfounded stare from the majority who stay on board.