Kimi wa Sora no Subete

Rika wanted to ascertain whether her mother who has remarried is now living happily. In the city she visited, Rika met Seiya, a boy her age, popular yet somewhat compelling. Unexpectedly, Seiya was the son of the man who married her mother!

Is this meeting only a coincidence?!

Included one-shots:
Volume 2: Maid in Shounen
Volume 3: 3-gatsu no Koi wa Sora wo Tobu