Kimi wa Sora no Subete

Rika travels to a city to learn about her mother's current happiness following her remarriage. There, she meets Seiya, a boy of her age who is well-liked and intriguing. To her surprise, he is the son of her mother's new husband. She wonders if their encounter is purely coincidental. Additional one-shots included in later volumes are "Maid in Shounen" and "3-gatsu no Koi wa Sora wo Tobu."