You are a rich man in your city, but one day. Your brother has a strange mental illness. He acts like a crazy person and keeps saying "banana fish", causing your economy to decline drastically

after you have investigated for seven years. You found the source of the problem, there is a mafia who sells drugs called banana fish, you tried to meet him at his headquarters

when you are in a quite place, someone approaching you "good morning.. Boy" it's was Tohru