Hung up on a Japanese girl, but you never date her? You never even summon the courage to talk to her, but you worship her from afar? It happened to Rivers Cuomo, and he got Pinkerton out of it. I'm guessing the same thing happened to Scott Murphy.
While you've heard of Weezer and the rise from the ashes success of their sophomore effort, Pinkerton, you may not have heard of Murphy and his band Allister. But Allister is one of the few bands that can honestly say they're big in Japan. So it seems perfectly natural that two dudes hung up on heavy guitars and Japanese women might get together and write a bunch of songs... In Japanese... And turn it into an album.