From 701 Goushitsu Manhua

Title: The Unexpected Betrayal In the heart of bustling Tokyo, Youta and his older brother Kazuki lived a quiet life, their bond seemingly unbreakable. However, when Takamasa, Kazuki's charming colleague, entered their world, a ripple of change began to stir. One fateful evening, a simple dinner conversation turned into a life-altering bet. Takamasa, with his confident demeanor, challenged Youta to resist his advances for a week. Little did Youta know that accepting this challenge would unravel a web of deceit and desire. As the days unfolded, Youta found himself inexplicably drawn to Takamasa's enigmatic allure. Despite his efforts to stay true to his initial resolve, Youta's heart began to betray him, yearning for something he couldn't quite comprehend. Amidst this emotional turmoil, Kazuki remained oblivious to the brewing tension under his own roof. Consumed by work, he failed to see the cracks forming in their once harmonious existence. Youta, torn between loyalty to his brother and newfound emotions, grappled with an internal conflict that threatened to consume him. On the eve of the final day, Youta stood face to face with Takamasa, his heart heavy with unspoken truths. In a moment of raw vulnerability, Youta bared his soul, laying bare the complexities of his emotions. Takamasa, too, shared his own revelations, shattering the fragile illusion they had woven. As the layers of deception peeled away, Youta was left reeling from the betrayal that cut deep. Through the pain and heartache, he emerged with a newfound strength, his spirit tempered by the unexpected twists of fate. Love and betrayal intertwined in a dance of shadows, leaving Youta forever changed by the bitter taste of truth.