At times like this, you think, if only you were an adult …

Saori is a younger sister who always wants to meet and talk to her sister, Iori. But her sister has a lover, and it’s hard for her to catch up to Iori because of work. One day Shizuku contacts Saori. What does that woman – who is also her classmate – mean to her …!?

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こんな時、大人だったら…そう思う日がある。年齢の差がもどかしい…。

姉・伊織といつでも会いたいし、話したい妹・沙織。でも…姉には恋人がいて、仕事の都合もあって予定が全然合わないことが辛くて…。そんな時、つい連絡しちゃうのが雫。クラスメイトでもある彼女は私にとってどういう存在なのだろう…!?