Uchida Kazuna manga
Due to Yuto's sudden death, Eiji, his elder twin brother, who was merely a college sudent, was forced to substitute for the charismatic vocalist of a popular rock band. The guitarist, Toru, who loved Yuto, painfully watches Eiji, who resembles Yuto, while at the same time, Hikawa, who is Yuto's lover and also the producer of their band, tries to have sex with Eiji as he doesn't know the truth. And then...?
From Deux: Upbeat Ritsuro and downbeat Ken have been longtime friends. Although Ken leads a dark life of prostitution after dropping out of high school, Ritsuro still cares about him. When Ritsuro realizes that what Ken wants is something more than friendship he vacillates between Ken and his girlfriend Moeko, setting the stage for a bizarre love triangle.