Hakka Haien no Shujin to Shitsuji

After fleeing a specialized child development center, Jougasaki Nanaki has been forced to survive on the unforgiving streets through petty theft. His solitary existence takes an unexpected turn when a chance encounter with a figure from his past guides him toward a sprawling yet dilapidated mansion situated on the quiet outskirts of town. Within the decaying estate's grounds, Jougasaki witnesses something impossible: a young boy vanishing directly through a solid wall before his very eyes. Driven by intense curiosity and a desire to uncover the truth behind this inexplicable phenomenon, he decides to linger rather than flee. He secures a position as the household's butler, embedding himself within the mysterious residence to unravel the child's secret. However, the hidden truths lurking inside the manor may prove far more complex than he ever anticipated.