Yuu suspects that his father is really a stepfather, and Yuu and Miki fall in love with each other.

Miki wants an ordinary family but her parents change that and she now has a stepbrother.

Miki is jealous when Yuu attracts the attention of a co-worker and their relationship and their ideal vacation plans are at stake.

When Yuta, a boy from Nina's home dimension, enrolls in her Earth school, his motivations are suspect even before he secretly gives her best friend Ayu a camera

Yuu returns from school and reveals the real reason he broke up with Miki.