Ano Niji o Koete

From Sugar-Oasis:
"I wish I was born in a normal family..." A high school girl, Sakamoto Kina, is one of the nine children in her family. She's so embarrassed that she can't tell people that she has such a big family. Of course, she can't tell Noguchi-kun, her crush, either... One day, Kina's mom, who is usually energetic, suddenly collapses...!!