It's Yume and Mizuto's first summer together as stepsiblings. Their parents are unable to return home one night due to a typhoon. Now alone in the house together, trouble arises when Yume spots a certain creepy crawly in her room. On another day, Mizuto accompanies Yume clothes shopping for a swimsuit in preparation for an upcoming family trip to the countryside. It's in situations like these that the two seem to be finding themselves reminiscing about the past more and more...
I thought it was just a character study,
،ظننتُ أنّ موضوعه دراسة شخصيّة فحسب
Ich dachte, es sei nur
eine Charakterstudie,
Pensaba que era algo más casual,
pero es un buen misterio,
Pensaba que era algo más casual,
pero es un buen misterio,
Les énigmes étaient plus élaborées
que je le pensais.
Pensavo fosse solo incentrato sui personaggi,
Pensei que ia girar
em torno dos personagens,
Я думала, тут только персонажи 
интересные, но и сам сюжет что надо.