March 5, 20XX.
Hikaru, a seemingly cynical and grumpy young man, who ran away from home for unknown reasons, has earned himself a really bad reputation over the last two years. But even though he's dissatisfied with his current living conditions, he can't find the right motivation to make a significant change and get back on track.
Aiko, on the other hand, is his complete opposite: lively and naive, she unwillingly wreaks havoc with her behaviour wherever she goes, and she always manages to overcome the hardships she bumps into. There's only one thing on her mind: achieving her goal, for which she is willing to give it her all.
Their paths, by pure chance, cross: to pursue their goals, they make a deal.