Operating as the primary antagonist in the *Triangle Heart: Sweet Songs Forever* OVA, The Fan is a terrorist stalker relentlessly pursuing Fiasse Crystela to seize her inheritance. To bypass security, the character infiltrates Fiasse's concert disguised as a woman. The Fan's core motivation is obtaining Fiasse's inheritance, believed to hold immense value, driving a campaign of death threats and intimidation letters.

The Fan acts under a terrorist organization identified by a clover leaf symbol, the same group responsible for assassinating Fiasse's father, Albert Crystela, years prior. The pursuit reaches its climax in a confrontation where the inheritance is revealed—a honeymoon villa deed and home videos holding deep emotional significance but no material worth. This revelation renders The Fan's violent efforts utterly futile.