This is a fan-made wiki, so anyone is allowed to contribute to the content. Be sure to check out the above links for how to get started. Synopsis World-famous handsome mechanical engineer Koshiro Tatara and scary-looking musclehead Kaname, these polar opposite twins both fell in love with the same girl's smile. Since then, they compete daily to see which of them can make her smile more. But one day, tragedy suddenly strikes Koshiro...