Mizuki and Ena are dating for a year now and everyone on their school knows Mizuki is dating but they doesn't know who. Ena doesn't know about it because even though they both study at the same school, Ena has night classes while Mizuki has day classes. The only clue the students have is the ring Mizuki wears(that she and Ena match)

One day ena went to get Mizuki because they marked a date in cafe and Ena was waithing in the school gate and then she saw Mizuki with her friends.