Maou has been unable to forget her ex-boyfriend Koichi for five years since their bitter breakup. Unable to move on to new relationships, she visits a real estate agency on the advice of a fortune teller, hoping for a change of heart. To her shock, she discovers Koichi works there. Even more surprising, the apartment she chooses has Koichi living right next door. As if to fill the empty years apart, their fates cross once again.