As birth rates decline, in an effort to increase the total population of Japan, the country has implemented a pet-humanism policy as more and more... more>> owners "humanize" their pets. Having them become members of society Japan begins to experience a hike in economic growth as well as an increase in crimes committed by these "dogmen" and "catmen". Amid such social unrest, what could be of bigger concern to one cynical high school girl named Ao? <<less

The manga is composed of various episodes linked together by the mysterious boy with no particular name. The boy travels to different times and places,... more>> trading with different people, letting them see a glimpse of their future or past, or the secrets of others, and bets to see if they can change their fate. <<less