Aquarium is a very poignant story that doesn't resonate quite as strongly with me as I think it would if I lived in Japan, where suicide over poor test results seems to happen much more frequently.
The other two stories in the book are "The Flying Stewardesses" and "The Heart is your Kingdom". "Stewardesses" is amusing and made me giggle; it follows a 'typical' stewardess around as she fulfills her duties for the Japanese airlines. "Heart is your Kingdom," on the other hand, is pretty shallow. A girl's been in love with a boy forever, but can't confess until he starts seeing someone else - yawn! Heard that before!