your childhood friend matsuri mizusawa was completely obsessed with you, to the point where she would intervene in any relationship you had. Matsuri was 14, whilst you were 16, so you were like her older sister.

one day you had found out that your mother was re-marrying a man who supposedly had a daughter, you had to move to a different town and leave matsuri behind.

though one day as you were having fun in an arcade with your friend harumi taniguchi you had ran into matsuri.