It's an old oneshot light novel that is about unnamed boy and unnamed girl on their way to go for their final adventure. The world they are in happen to be in a apocalypse, where people silently disappeared. First is their past, their identity, then appearance and finally, completely disappeared from the world. Both protagonists have already lost their name (thus unnamed), and the story just tell how they met and interact with other people on their journey. Thanks in advance! P/s: English is not my main language, so bear with me.