[Machine Translation] Will the irrevocable "love" lead us to heaven or hell? Please, if I am wrong, Miyamine will stop me here and now. If I am wrong, Miyamine stop me here and now. My girlfriend, Kage Yorikawa, is the perfect, charismatic girl that everyone admires. However, she is the organizer of "Blue Butterfly," a suicide-inspiration game that has driven over 150 people to commit suicide without their own hands. My childhood friend, who is the only one who knows the secret, decides to protect her, guided by the promise he made to her in elementary school to "become a hero. I imagined many times. If only her talent had been used in the right direction.... But the darkness of Kage is deep, and behind it all, their pasts and their causes and effects are intertwined. A heart wavering between morality and love eventually leads to an ending that no one could have predicted...