No. 'Death Note' is a work of fiction. It is a popular Japanese manga and anime series created by Tsugumi Ohba and Takeshi Obata. The concept of a notebook that can cause someone's death by writing their name in it is a highly imaginative and fictional idea.
There is no true story behind 'Death Note'. It was created as a work of art in the form of manga and anime. The story contains many fantastical elements such as the Shinigami, or death gods, who drop the Death Note into the human world. This is all part of the fictional universe that was carefully crafted by the author, not something that has any basis in reality.
No, High Note is most likely a work of imagination. There's no indication that it's rooted in real events. Usually, such creative works are crafted to entertain rather than being based on actual happenings.
Since it's not a true story, but in the 'Death Note' work, the main themes include power and corruption. Light Yagami, who gets the Death Note, becomes corrupted by the power it gives him. He starts believing he can be a sort of 'god' and decides who lives and dies.
The High Note is not based on a true story. It's a work of fiction that likely drew inspiration from various sources but doesn't have a real-life counterpart. The plot and characters were invented to tell an engaging tale for the audience.