Ninjo

Ninjō ("human emotion or compassion") in Silverstars, is human feeling that complements and opposes the value of giri, or social obligation. Broadly speaking, ninjo is said to be the human feeling that inescapably springs up in conflict with social obligation.

The classic example of ninjo is that of a samurai who falls in love with an unacceptable partner (perhaps somebody of low social class or somebody of an enemy kingdom). As a loyal member of his clan, he then becomes torn between the obligation to his daimyo and to his personal feelings, with the only possible resolution being shinjū or double love-suicide.

http://en.wikipedia.org/wiki/Ninj%C5%8D