his biggest motivation for developing his power and guitar skills is han, a girl he met when he was a child and has liked ever since. to save her life, he rushed into "mie" (滅 / "destruction") to rescue her trapped soul and was willing to trade his soul for hers. when they both safely returned to the human world, their love blossomed, but not without trials. first, his father told him han was his half-sister. they were forced to separate and treat each other with indifference. then, he found out han was part his paternal grandfather’s conspiracy to dominate the world. but the good news is that he and han are not related and the two finally get a happy ending.