I was supposed to start living alone when I moved to Tokyo for college. But my hopeful beginning gradually turned into a colorless daily life where I didn't talk to anyone. Then one day, a single mother named Ruisa moved into the next room with her young daughter. Seeing her, so small and fragile, desperately trying to be a strong mother, I couldn't look away. Our relationship began with small favors, but slowly seeped into my heart. Every time she smiled and said "thank you," warmth spread through me. Before I knew it, Ruisa had changed the colors of my world. Two lonely souls, gradually drawing closer—heart and body alike. But this peaceful time didn't last long. From her past came Tatsuro, her ex-husband. Faced with his shouting and violence, I could only freeze in fear. I felt powerless. But when I saw her tears, something inside me screamed, "I will protect her." No matter how cowardly or weak I am—I'll stand up for her smile.