This is the sequel of G-Senjou no Neko, or more a side story about the cousin, Saki, and his past relationship with the english conductor, Irving.
It takes place during the summer time where the boys, Saki and Riya, travel to America for a small concert in a church hosted by Saki's senpai. Upon arriving to the summer estate the boys find that noone else is staying in the large hostel except the handsome but stern-faced man, Irving, who was Saki's previous "sex-friend".
Straight away you sense the tension between Saki and Irving, and the relationship is proven still alive after Irving visited Sakis bedroom in the middle of the night.
Saki was fickle teenager that trampled over people's emotions. It's a completely new side of his character, compared to his personality from G-Senjou no Neko, and the events were a bitter-dance between Irving and Saki as they both tried to prove to each other that they didn't care about their break-up or their lingering emotions.
Honestly, I didn't really like this story that much, overall though, the art was amazing (new and fresh, as it was more recent that G-Senjou no Neko) and the dialogue was interesting and well planned, however, I just felt the scenes were a tad boring and at times I found myself losing interest.
Saki battling with his own emotions was more interesting than anything else, however, my 7/10 score comes from the first chapter; which was about Riya and Ikeda's reunion once he returns from his studying aboard. One word: HOT!
I would still recommend reading this straight after G-Senjou no Neko, as it has the main conclusion to the story, but not important as it's just a side story - as I mentioned above - about Saki's facing his emotional demons; Irving.
Copied from my MyAnimeList review