House of the Sun

Taiyou no Ie (たいよう の いえ), known as 'House of the Sun', is a 2010 shojo manga series by Taamo. This series won the 2014 Kodansha Award for Best Shoujo Series.

Plot
Motomiya Mao is a High School student who has "lost a home" after her father gets married again. She starts to live with Nakamura Hiro, 23, who knows Mao since childhood. Since that time Mao spent all her free time with Hiro´s family and after his parents deaths, he´s waiting for the day when his brothers and Mao would once more live together.

Official
Official Website of the author, Taamo: http://taamo.sakura.ne.jp/

Other Sources
http://www.mangahere.co/manga/taiyou_no_ie/