Espelancer

I'm surprised that nobody has mentioned Clannad. I have never experienced as much emotion any other anime as I experienced from Clannad.

The yakuza won't mess with you as long as you don't interfere with or get entangled in their business. The yakuza actually have a code of conduct that its members live buy and they aren't likely to randomly mug you unless you give them a reason. This is the same Yakuza that provided truckloads and truckloads of emergency aid and supplies to the victims of the Great Tohaku Earthquake even faster than the government could. As long as you avoid shady areas and stay in well lit, populated areas, you'll be just fine.