"Fatal Yandere Love Triangle" is a simulation game set in a high school environment where you find yourself entangled in a complex relationship with three girls who harbor deep feelings for you. From blackmail to signing questionable contracts, you navigate through the pressure of dating each girl while keeping their existence a secret from one another. As the story unfolds, you must eventually make a choice that will determine the fate of the girls involved.

The game features three distinct characters - Tsumugi, the Quiet Poet; Yuina, the Witty Streamer; and Iroha, the Mature Childhood Friend - each with their own unique personalities and motives that add layers of complexity to the narrative. Players are challenged to unravel the mysteries behind these girls' obsessions and make decisions that will shape the outcome of this intense love triangle.