Mon Seul

Following the dissolution of their parents’ marriage, college student Masaki Ikeuchi and his elementary-aged sister Minami are left to navigate life without parental guidance after their mother remarries and their father abandons the family. Sharing a modest home with Masaki’s roommate and closest friend Kanda, the trio forms an unconventional household bound by necessity and mutual affection. Despite their precarious financial situation, they manage to sustain a difficult yet genuinely happy existence, finding stability and warmth in their shared daily struggles and quiet moments of domestic camaraderie. This fragile equilibrium shatters when Masaki returns home from his part-time job earlier than anticipated, catching Minami off guard and triggering a cascade of unforeseen consequences that upend their carefully maintained routine. The unexpected disruption exposes hidden tensions and vulnerabilities beneath the surface of their makeshift family life, forcing each member to confront uncomfortable truths about their interdependence and individual emotional needs. This volume also includes five supplementary non-story chapters that provide additional context and background material separate from the main narrative arc.