Shuichi competes against a much better and sexier singer names Ryuichi that basically whoops his booty in singing. But Shuichi starts to let loose his own bottled up talent while being stressed with his relationship with Yuki.
There is even a highly developed attack called the KUMAGORO BEAM Ryuichi uses to protect himself from Tatsuha, Yuki's almost twin-like and perverse brother
"It was gravitation: I fell in love with a person who just happened to be the same gender as I."
"Melissa was romantically attracted to Nicole because of her personality, but was not attracted to other women."
"I'm not gay, but I've been in gravitation before."
"Jason didn't consider himself bi because it wasn't a person's gender that interested him, it was their personality."
"You can fall in love with a man, but not be attracted to any other men."
"Though he was never attracted to young women, he fell in love a girl half his age because of her wit and sense of humor."
Shuichi struggles through the sudden popularity of his band, and his rocky relationship with Yuki Eiri. As the author struggles with his new found love for the vocalist and his dark past.
In the end they both rely on the gravitation of love to pull them together.