from Mangahelpers:

After the death of her grandmother, the orphan Himeno moves to the temple of the Natsume brothers and learns a devastating secret. She was not related by blood to her grandmother! She was actually abandoned as a baby in front of the Natsume family's temple. They wanted to adopt her as a little sister then, but circumstances forced them to give her up to the woman Natsume knew as her grandmother. Now, 15 years later, the oldest brother Ichika is 26, and finally capable of legally taking guardianship of Himeno. The other brothers are Chouji, who's in college, and the gorgeous two younger brothers Fuuzou and Tsukuya, who attend Himeno's high school. Will the love of her new adoptive brothers help her overcome her grief and build a new family and home? [tethysdust]