[Crossover] The Ten-Thousand-Year Bamboo

A demon formed from bamboo, with delicate, beautiful features. He loves quiet and avoids crowds, and is skilled at playing the flute. By nature, he is aloof. Both he and his music are rare encounters. "There will always be a bamboo grove somewhere in this world. There, you will see a man playing the flute, his figure elegant and mysterious. He is untouched by worldly concerns, yet always lingers in your thoughts." I heard that U.A. High School had hired a new music teacher. His name was as unusual as he was, and left a deep impression: Mannendake. Just like his name suggests, his bearing was exceptional. His refusal to let people come close was striking and distinctive. "If you are afraid of getting hurt, please don't make contact in the first place." "Why make contact again, then? Are you afraid of being lonely? Humans are complicated." Mannendake stood tall and graceful, lowering his head to caress his jade-green bamboo flute: The bonds between humans and demons cannot be severed, even after thousands upon thousands of years. That's why he met that troublesome little girl deep in the bamboo grove. (In the tale of his biography, Mannendake watched the little girl grow through her entire life. After seeing her death with his own eyes, Mannendake began to want to understand humans, and wanted to try observing them up close. As it happened, he ended up at U.A. as a teacher by a twist of fate. This is my own setting~ Don't worry, this story has no romance. The little girl is still a child in Mannendake's eyes.) Theme: